I don't see any reason to dump Kerfoot somewhere, if we can get good value and maybe keep some pieces of Kadri trade beyond next season it would be nice. He is very good player for that cap hit and need to be replaced, but his contract probably makes him interesting to other teams and if we can milk it we should do it.
One for one I wouldn't replace him just for sake of making moves. Though I see Brown as piece I could see filling his shoes. Brown can PK, PP and is from Toronto. He has the will and the skill, if we can use that Kerfoot contract and replace him with Brown + add something to the overall transaction I think it could be win-win.
Brown can't be the main sweetener. In best case scenario we could get Murray, replace Kerfoot with Brown and get one good young player that would be here even if we lose Brown next summer.
I think the interesting thing in this Murray trade is the added value and how much we could get it. We should go big for next year. Every other contending team has lost assets this summer, if we can keep our core + add something extra, that would be huge. Ottawa has good talent pool to dive on.
We just need also good goaltending. I don't know if I would bet my future on Murray, but we'll see.