Bishop's an ILB, Kampman's an OLB.
Chillar is pretty much back, I think, bumping Bishop down the depth chart one more spot.
I think that he got some time when Chillar was out. Not that much, of course, as he's still not a starter, but he wasn't that impressive. He wasn't talked about much, either, though, so I guess that that's a good thing for a back-up.