The thing that annoys me is I think he's better than Collins and I'm not exactly sure why/how Collins is here and not K Mart. Now we're in this place of thinking there has to be a choice between a big and a guard and I feel like we shouldn't be there. I also think Christmas or Joseph better show something kind of quick because if we keep one for the future and he becomes so/so then we hurt our last chance at a ring to keep a so/so player
Roles. I am with you that KMart is probably a better player at this point than Collins (although I am not sure it is that far off...KMart has fallen off a lot). But Collins fills a real specific need that they didn't have. A long, tough, low post defender, who can handle guys like Howard and Bynum. KMart won't really give you that.
In reality, Martin really just gives you the same things Wilcox gives you at this point (and is probably a step below Wilcox actually). Which is valuable...but it is not a real need of this team with KG, Bass, and Wilcox already here.
Collins won't be useful against probably 80% (or more) of the league. However, against that 20% (including one team in your division...perhaps 2, if Lopez gets down in the post more), Collins provides a real asset, and someone who would likely play minutes no matter who was healthy. I am not sure KMart would be playing any minutes if everyone is healthy, which makes him purely depth, which is less valuable.