It's a given that Mike is returning. I don't believe he's been on that boat all this time. An entire episode (which I'm sure Michael will have) taking place just on the freighter would be boring as crap to me. SO, he would have an off island flashback combined with a freighter flashback.. that would be cool. I'm confused as to why the hell he'd get back home then go back to the island, but maybe it's all about Walt? Maybe Walt is the reason he goes back - like possibly Walt is threatened - again. *sigh* I sure as heck don't have this all figured out, but Michael was the first one to come to mind when Ben said he had a spy. I still believe that.