Sanchez did his job in that game. Got some help. Manning lost to the road team with the young QB. And it's not like Manning did anything spectacular in that game.
Well at least you're acknowledging that players other than QBs impact the game!
Manning completed 69% of his passes, had a TD, and had 225 yards in 25 attempts. That's a good to very good game.
Sanchez completed 58% of his passes, had an INT, and only had 189 yards in 31 attempts.
He didn't outplay Manning. Once again I'll add that he doesn't have to play the Jets defense either. He faces a very different challenge than the opposing QBs.