That was the plan, wasn't it? But for some strange reasons, after much brouhaha of Dean being Michael's vessel, the writers decided to change the storyline after more than halfway through the season. Very odd, that. I wonder what made them change their mind.
The only plausible reason that I could think of was that they initially thought season 5 was going to be the final season and the final confrontation would be between Michael!Dean and Lucifer!Sam with both of them perishing in the end. Then TPTB decided to continue with season 6 hence the last minute change of Adam being Michael's vessel. Such an anti-climax, the much awaited fight between Lucifer and Michael. I'm glad that we had a season 6 of course but argh :/
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The only plausible reason that I could think of was that they initially thought season 5 was going to be the final season and the final confrontation would be between Michael!Dean and Lucifer!Sam with both of them perishing in the end. Then TPTB decided to continue with season 6 hence the last minute change of Adam being Michael's vessel. Such an anti-climax, the much awaited fight between Lucifer and Michael. I'm glad that we had a season 6 of course but argh :/