Ginobili's ability to change direction between dribbles is devastating the Suns perimeter defense. The best chance that the Suns have is giving him that jumper of his and hoping that it's not falling. He's scoring at will because he has the same benefit that Tony Parker experiences- namely that interior defenders consistently stick on Tim Duncan to prevent an alley oop or dunk. If the Suns change that presence, I think Ginobili's points will simply be "transferred" to Duncan's statline.
Ginobili is playing well but there is no way he is the Spurs's MVP. Duncan is averaging more points, assists, rebounds, blocks, fg%, has less turnovers, and his defense is a million times better. I find it hilarious the illogical extents that many will go to find someone on the Spurs more valuable than Duncan, a la Parker winning last year's finals MVP. It's just nonsense.