bottom line, when scoob jumps alot, his form does improve and he hits some pretty good jumps..
his first issue is, he will jump ~2x/week for 4 weeks, then take 2 months off to do something else like marathon/powerlifting etc.. then come back and jump 1x/week, etc.. he has consistently been inconsistent over the years, that's his main issue..
his second issue is his relative strength.. ~20% body fat is not good for jumping, don't care how strong you are.. but he's not strong enough to overcome such a bodyfat level, so what you see is some pretty mushy jumps.
his third issue is that he does lots of conditioning with his basketball teams.. if you combine that with the fact that his jump frequency is low, you have major problems.. all of that conditioning will cause "unreliable prediction of performance", by that i mean, you won't really know when you'll have a good or bad day.. so with a low frequency of jumping, your chances of having a bad day increase.. you'd have to jump max effort at a low to moderate volume nearly every day to get your body used to producing force fast in the face of all of that conditioning.
his fourth issue is he changes his routine ALOT and doesn't incorporate some key exercises like calve raises etc.. he thinks calve raises are bad because of things he's read, and it's unfortunate.. he needs to squat with an emphasis on overall speed AND speed at traversal, NO GRINDERS.. he easily goes back to grinding out reps, crazy slow squat speed, which is not good for fatigue or his CNS adaptations...
fifth issue is, it's hard for him to fit in reactive work with all of that basketball stuff he does.. he needs to get in some reactive work BEFORE EVERY lifting session.. not DJ's, i'm talking low level rebounds.. he always wants to DJ, but he needs to get better at just simple rebounding exercises... dj's are great but when you have become "so unelastic", you need to work on the basic exercises to get that "initial pop" back before doing stuff like dj's... his depth dropping is fine, but he needs to train more like a spring BEFORE his lifting sessions, which should really wake him up for lifting also, and keep him focused on lifting with speed.
that's what i've been seeing for a while.. these issues are similar to the ones i pointed out way back on TVS..
he just needs a very basic routine, emphasis on lifting with speed, incorporate some low level reactive work before each lifting session, jump max 3-4x/week, and stay completely consistent with it... not 2 months on, 2 months off, etc..
pC
edit: his jumping "form" in terms of runup + plant looks "weak" because he is weak relatively, reactively, doesn't jump enough, and carries too much bodyfat.
fixing any of these issues will yield improvements in jumping and his "technique".. fixing all of them will have him getting up much higher.