Nilsson was stopping pucks, Talbot wasn't. Simple as that.
Your personal scouting report of each player doesn't mean anything to me. I trust the Oilers coaching staff infinitely more than I trust you on this matter.
Yeah, I'm not sure how it's even up for debate. Nilsson was playing much better than Talbot was for a stretch, and now Talbot has been playing better and is getting more starts.
I will say though, it's very nice to have 2 goalies that have a save % north of .900 for a change.