Banking off your post, I'd have to say that a lot of it also depends on the tactics.
Run-N-Gun for example creates jump shots at a high rate and needs your shooters to have good driving as well. I've noticed that I don't get a whole lot of assists in the RnG despite having an all-star caliber point guard. With that in mind, driving enables a player to create their own shot and in the RnG, you need your wingmen to be able to create their own shots.
Lowe stamina equates to poorer attempts. Lower game shape equates to playing at lower levels. I like to think that at the highest level for game shape, the more closely your players play to their actual level.
As far as the Kobe on a team of 10-year olds, I think Kobe would dominate. Just sayin', ya know. ;) FYI, I do get your point, lol.
Speaking of secondary skills, is there a thread that discusses these for each position and relative to the offensive scheme?