Same, it seemed very haphazardly explained. Also why didn't super sophisticated Starfleet scanners not pick up SOMETHING was up? That whole "oh we just thought it was nothing" explanation is ludicrous for someone coming out of imprisonment on an enemy ship with substantial trauma.
Gotta say, though, did not see that plot twist coming at the end of last ep. Not necessarily thrilled about where this seems to be going, but hey, I'll give credit where credit is due they put in the clues and everything but it wasn't exactly obvious.