okay I was watching “The End” and I realized how important this scene was so here I am
Castiel didn’t lose his grace because it was taken from him.
When Cas fell in season 9, we all remembered end!verse. But in the season 8 finale, Castiel’s grace was taken from him. It didn’t drain away.
Then, Cas took another angel’s mojo. You know what this means? This mojo can drain away, because it’s not his.
And look: the other angels left him, they bailed.
Remind you of Bartholomew’s army who joined Cas in season 9? They have high expectations for Cas, they want him to lead them, they want Heaven back.
But remember what Metatron said? Something along the lines of “In my story, you’re the villain.”
If Metatron tells the angels he can give them their home back, who can guarantee they won’t turn on Cas?
I thought season 9 was completely ignoring End!verse, but look.
End!verse Cas isn’t the Cas we saw in the beginning of season 9. It’s the Cas we might see towards the end.