If Ian was working for Stefano since Ian slept with Stefano's wife Kate. Then again, Stefano is extremely messed up anyways. lol So, it's hard to say. I'm going with "no" on him working for Stefano only because I read that Ian was looking for DiMera secrets. So, if he was working for Stefano, he would have already had access to the DiMera secrets. Also like I said before, I doubt Stefano would have another guy sleep with his wife willingly.