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^ of course, a good leverage is always better than a bad leverage regardless of training experience.

Thanks...for some reason I didn't make that connection.

You should box squat like Lance said.  Pay attention to the way it feels when lowering to the box and then try to achieve that same feeling w/a full squat. 

Right now it looks like you're falling into the trap of using the mirror and safety rails to gauge your depth and achieving what you believe to be sufficient depth by lowering your upper body instead of sitting more into it with the hips.

<a href="http://www.youtube.com/watch?v=6OwdhRHWcrA" target="_blank">http://www.youtube.com/watch?v=6OwdhRHWcrA</a>

weight- 173 lbs

body fat- 19-22%

Are you sure that's right? That seems very high for someone who only weighs 173.  What did you use to get that measurement?

As others have pointed out it's very very very unlikely that this is true.  If volleyball is even in the top 5 it is due to women's beach volleyball and I doubt 90% of that audience cares what sport they're playing so long as they do it in bikinis.  No one gives a damn about men's volleyball.  Curling probably has a larger audience than men's vball.

And why would you have him do something ineffective and unproductive that most don't succeed with rather than something that works well for most people?

Your "something that works well for most people" is to lift weights and get stronger.   My "something ineffective and unproductive that most don't succeed with" is to to use BW for as long as it provides enough resistance to make the movements difficult.  In my experience working out w/teenage basketball players w/similar thin frames, BW is sufficient resistance.  Not to mention more convenient than relying on mom or dad for a ride to the gym and coming up with $ for gym fees.  Hence my recommendation.

In my position, if you had 2 weeks to put 5-15kg on your squat, what would be the best way?

If I had to try I'd probably do 3 days of lower body and spread the following throughout those days:

Band assisted sets of 3 w/130
1 variation (e.g. box squats)
1 alternate stance squat (e.g. sumo or narrow depending on my weaknesses)
Partial reps in the bottom 1/4 for a few sets of 3-5 reps w/a decent weight & bands for added resistance

Car or prowler pushes
Sprints
Weighted Step Ups

8-10 sets of heavy singles
Heavy partial reps (130+ if you're not able to do 130x1 yet) at a depth between quarter and half (or justhalf if possible)
A few negative reps @ around 150

I'd throw in hanging leg raises, weighted situps, hyperextensions & oblique twists on the 1&3rd day.  No idea if that would work but if left to my own devices that's what i'd try.  I wouldn't try what Kingfish is doing as he's doing it for maintenance and not to build strength and from personal experience, you'd see a dropoff in strength at first.  I'm a fan of mixing it up also so I'd prefer something w/more variety than smolov jr.

I woke up sore around the right glute area. That's new. I can't remember the last time that's happened. Using that as feedback, may mean I need to strengthen my glutes for jumping.

Could be a sign that your glutes are becoming stronger and providing a larger portion of the force in your jumps.  That's what happened to me when I started doing box squats last year and my pc became dominant.

he jump stops as bad as arowe or vag, worse than me. what were they using to measure there? jump mat in embedded in the ground or something?

His jump stop wasn't *that* bad.  He's using the new Nike+, it has sensors into it or some bs they pitch to get you to pay 250 for them.  http://support-en-us.nikeplus.com/app/answers/detail/a_id/22904/p/3169,3700