The guy has that winner instinct and is clutch, his game probably at all time high now. He was mostly non-existent when Spurs won the championship though, but you could see last year that he was determined to make a difference.
Fortunately, Mills also has the instinct. I can't say the same of Anderson, I've seen him miss to many must make shots already.
Simmons is also clutch, what's suspect is his long range shot. I don't think he has that natural talent that Mills and Belinelli have.
With McCallum, he's better than Joseph, but I can't say yet if he can make it rain from 3 point land.
Ginobili is pretty much finished, I'll cringe every time he attempts a 3 pointer!