OK, less quoting this time, XanBcoo

1> you said "some ninja are more talented in some areas than others, it doesn't mean that they suck in those others"
I agree somehow. but, in that case, could you say "Sakura could win Lee in close combat"? Sure, Sasuke has good combat skills as well ... but there is no way he can beat Neji in close combat (but for sure, sasuke could beat Neji in something else, just like Kakashi and Gai.)
About the Speed, we see Sasuke speed when vs Garra, and Neji speed when 128 hits, but we can see Sasuke run out of stamina very fast. But on the other hand, Sasuke may has a stronger hit because Neji does "intra-damage" instead of Lee's phy damage.
2> kaiten, let just end it, no result anyway
3> 64 hit... "you'd have to assume they're using them at the same time." <- My simulation is Neji use 64 hit right after Byakugan (sasuke use sharingan in the same time), so Sasuke won't have any time to form any hand seal, so he cannot use ninja teachnique (for sure, that is i assume he need hand seal for all his attack Ninja technique, and i don't know does Sasuke know non-hand seal spell)
if Sasuke prefer use other skill besides sharingan at begining, the simulation will not the same, but i don't think sasuke will stand a chance if he don't use sharingan at very begining.
4> Genius - Well, we can open a new thread to discuss it ^_^