Perhaps the skill is influenced by fatigue (getting to the line just when he should get subbed, crappy stamina etc) and game shape.
prety right on if you ask me!
game shape seems prety important to me, in my experience , when it comes to sinking the fre throws.
Also when a player gets tired, he is more likely to miss.
but finaly, I also think that experience might play a role, especially when it is at important moments this might start to play a role too.
1 thing I am prety sure off: what is not used to see if he scores a free throw is all his other skills: jump shot; OD, driving, handling, passing, jump range,...
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