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"^ no offense to RutgersDunker or anybody who is sub 5'10.. but IMO, it will take a LOT more strength to get the same jumps compared to somebody with longer leverages.. (5'10++). if  RutgersDunker grows to 5'10+... he should be mid-forearming the rim with 2 hands from an SVJ with that leg explosiveness. i can SVJ the same rim RVJ grabs in his vids with a max squat ratio that is considerable lower than his." (Kingfish)

I don't really like giving advice or even posting much on jumping since I suck at it. But from what I've read from guys like Kelly B it seems like if you take guy A and guy B in your example you'd always expect guy B to be able to jump higher if they could both squat exactly 2x their bodyweight. This is because guy B has to produce a lot more force to squat 2x bodyweight than guy A.

Well...

I have been squatting consistently for 2 years and haven't got to 2x. Could I have gotten there? Of course, if I were to bulk and weigh 90 kg now. But is that really what I want? Sacrifice everything to get to 2x? Get my body broken down from all the jumps and landings because I weigh 90 kg? Only be able to jump a few times and go home? So on and so forth?

That's the thing. And I do kind of fit in that lanky category so...

Of course I'd like to be at 2x+, but is it worth it athletically? I'm feeling much more athletic now (jump higher, move better etc) than I felt when I was 86-87 kg with a squat 1RM of 155-160 kg. I have no idea what my squat is now since I haven't squatted in ~2 months but you better believe it's under NO WAY at that ~150 level right now.

Sure, stopping squatting helped recover and really "show" my built up potential through the months of squatting I did in the past, now that I had the chance to actually focus on jumping, but you get the idea.

This is actually very easy to answer and vag is getting decently close with his post.

Yes, it might be more difficult for one guy than for the other to increase his squat. We do not even have to get into the height and levers debate, individuals just vary in their abilities, period. But every healthy male under 40 has a very decent chance to reach the rather modest goal of a 2x bw squat IF he is willing to gain the necessary bodyweight to accommodate serious training and improvements.
There are gifted people (A) that do not need to gain ANY bodyweight to achieve a 2 x bw squat in less than 6 months. If you are that person, congrats to you, you lucked out in the genetic lottery. But most people struggle with that, HARD (B). They increase their strength, sure, but it takes them ages to get to decent levels because they insist on staying skinny. If you are that person, you are making life more difficult than it needs to be. More importantly, you are wasting very valuable time because it will certainly not get easier to achieve your athletic goals with the years.
There are basically two options if you are type B: You can creep forward 25 lbs in the squat per year while not gaining any bodyweight and maybe, MAYBE someday achieve your strength goal that way. Or you can make the reasonable decision and begin eating like someone that trains HARD and have a 2 x bw squat in a couple of months - guaranteed. Sure, you will be heavier. Sure, you might not see your abs anymore. But you are also much, much stronger to move the bodyweight around. 200 lbs is not a high bodyweight if you squat 500, is it?

Now, what is holding people back? It is a lack of realistic self-assessment of ones own talent (for example in regards to strength) and not doing the things that would logically correspond with such an assessment. In other words, if you are type B and make yourself believe that you could be type A, then you will be the guy that has a really, really hard time getting a 2 x bw squat. For everyone else, this is just an increment that comes and gets surpassed rather soon.

I heard that you should squat max about 2.5x bw else if you exceed that then you will start to slow down as you bulk up. so wouldn't squatting 3 or 4x bw slow you down.

There are maybe 5 people on this forum that get close to this number. I would not worry too much about slowing down after the 2.5 mark because you have to get there first.  

I heard that you should squat max about 2.5x bw else if you exceed that then you will start to slow down as you bulk up. so wouldn't squatting 3 or 4x bw slow you down.

1)Get to 2,5BW.
2)Test your vert.
3)Get to 3xBW.
4)Test your vert.
5)???
6)Profit.

My point was that you never know until you try.
I disagree with all extreme opinions, such as yours that says you are too heavy to jump and you are destroying your tendons being 87kg.
To make it more general, i don't like to read that "i heard going to 2,5*BW wil make you slow", go there and see if it made you slow.
Oh , by the way all those regarding DL jumpers!

Also , kellyb talking about that issue:

As for heavy weights making you slow, this is only true of people who carry strength training to the extreme. Even then, it's not the strength or heavy weight that creates slowness, it is the excessive muscular bodyweight that can develop. To verify this all you have to do is look at olympic weightlifters. Their entire sport is based on lifting heavy weights, yet they have the best vertical jumps of all athletes and are as fast as sprinters out to 30 meters.

( Found in http://www.higher-faster-sports.com/verticaljumpfaq.html )

You really believe that? For me personally, to get there, I'd probably have to not jump at all, just squat and get big. So basically I'd train to jump higher by not jumping at all and when I do jump, do 2-3 jumps, get tired/injured because I'm heavy, go home. Wow, great fun!

The amount of effort to get to 2.5-3x, time for recovery, money, food, weight, bodyfat, you name it - it... it's just not worth it in my opinion. I'd be all for it if I knew it would actually help me, but I'm not very sure about that.

It's not that you are (or ever were) in danger of getting close to 2.5 anyway, so that is kind of a moot point.

Of course there is no way to know whether a gain in strength is going to have a positive impact on your VJ or if the costs are larger than the benefits. But you don't get to redefine the costs, they are largely determined by your genetic potential and if a type B guy insists on not gaining any bw then it is very possible that he is wasting his time with strength training.

So it would be better in my opinion to just get stronger and swallow up the costs. Then evaluate the benefits and go from there.
What other reasonable choices really exist if you fall into the B category?

What other reasonable choices really exist if you fall into the B category?

What about really going explosive, be it going very heavy with very low rep ranges (1-3, since these rep ranges force the recruitment of a very high % of the motor neurons) or using lighter weights and moving the bar as fast as possible (where the bar actually moves fast as well). There will be some hypertrophy involved as well considering the TUT, not that much as a regular strength workout (say 3x5) but the thing would be to make you learn to generate a lot of force very quickly (faster neural signals).

As a B guy you're still probably far away from generating the maximum amount of power you can from your current muscles, with no additional hypertrophy, so why not work on improving that?

If you can squat 300 lbs and only use 50% of that in the jumps, and you improve onto using 70-80% of that in the jumps by improving the neural signals with no additional muscle gain, then you will jump higher.