Okay....okay.... it's plausible and I am not smacking my head on the monitor. So he has become like Desmond from Lost, jumping around to different imporant places in time. With all the exposure he has had to the Cosmic Cube, I could see that some of that energy to will himself around (subconciously) may still influence where he goes. And he may need Sharon to focus his will on being in the Marvel 616 present.
Boy, the time cops are going to love Steve....
I am curious whose body is in the chamber Namor is watching over?