He is our most important player right now, he plays far better than many who earn like him. He deserves every penny he is getting, because he plays hard every night.
Just though I'd update the list according to the formula I made in the In Depth: Bargnani thread:
(opponent's PPG + opponent's PER) x opponent's eFG%
This ranks players according to their on-ball defense, and gives them a rating (lower = better)
Amir Johnson: 19.25
West's numbers are far better than I would have guessed. And Maxiel...that's just awful.
My best guess about Bass, Bonner, West & Horford:
They are paired with great/elite help defenders, in Howard, Duncan, Okafor and Smith. This would help get them one to two extra stops that they might have otherwise given up. Not saying they aren't good defenders, but the value of having a great defensive presence down low is that everyone's defense benefits.