The graphic is kind of confusing, but since it has "stakes" and "spectacle" on the vertical axis, presumably that's the reason (stakes) why Bosh's shot is heavily weighted.
I think he understands it being so far to the left. The question is why is it so far south? It was a wide open 15 footer. The only reason it should be anywhere close to Holy **** is because it was effectively the Game 3 winner. And because we've now come to expect Bosh to probably not hit that shot. It should in no case be lower than Dirks Game 2 winner, which was a much tougher play, at the end of a crazy crazy crazy ass sequence.
Dirk's G2 winner isn't on there. It's part of the DAL G2 finish, which is closer to the center (and thus in the red) than Bosh's shot. So I think they got it right. Bosh's wasn't impressive...but it was on the biggest stage to date, and the game winner. If Dirk's G2 game winner was separated from the rest of Dallas's finish, I'd imagine it'd be further right than Bosh's, and closer to the center. It's a diagonal axis (along the curve of the semicircle), so "lower" isn't the proper way to compare 2 points.