No, that entire line from Michael was just some flat-out serious backpeddling by the writers. It was made abundantly clear that anyone an archangel (which includes Lucifer) possessed would be left a drooling meatsack after the fact. But even non-perfect vessels can easily survive the process now, as shown by John Winchester's possession by Michael where -- apparently -- it's entirely up to the archangel.
Except he told Dean he'd do the same for him if he agreed. Which is completely contradictory to the introduction of that fact to begin with (which was to warn Dean of what would happen if Michael possessed him).
Castiel is definitely a better fit to the show than Ruby or Bella were. It's probably been brought up countless times before, but Misha is the same guy who used to do all those Sprint commercials??
This episode was a definite improvement over some of the recent ones once I got past the "Cupid" opening. I may never want to hug anybody ever again!!
Obviously Jared Padalecki preferred Ruby #2 since he's going to marry her.
