I just got back home from Asylum 7 in Birmingham (UK).
Misha was there too and I had a coffee lounge with him.
Compare it with a Meet & Greet from Creation Ent, 20-30 people in 1 room with Misha for 30-45 minutes.
Anyway just before he had to go I asked if he thinks it was Castiel talking to Dean when he said sorry.
Misha answered and he was being serious.
No jokes etc the way he acts as when he does a panel.
He said it was Castiel talking, not the Leviathans