Your only looking at a quarter, or so of the game. Gameshape amplifies positively or negatively a players ability. Home court is almost like starting the game 0-8, maybe 0-10, if you have a PR guy with crowd involvement. Then Enthusiasm, looks like you CTed last week? He hasn't, but then you TIEd. Even if he normaled with a 6, to your TIE of 3/4? That is a big difference too. You just can't look at gameshape, and say, well mine was better, I should have won. It takes a collection of all the parts to win.
Good Luck with the season.