Wonder if later growth spurts can really benefit some player, because they should already kinda be pretty coordinated with better overall movement skills, and then you snap your fingers and put that in a bigger body. Sure you lose a little as a 6'5" dude generally isn't going to be capable of moving the same as a 6'0" dude and it'll likely take some time getting used to the differences, but you kinda carry a lot of that ability over still, I'd bet.
Kinda like if you grew up playing WR then moved to CB you might just have "naturally" (really through previous work put in) better hands than average DB because of that previous experience. Or a guy that started off as a QB then moved to WR is often more 'qb friendly' and better at IDing zones, etc.