I don't think Jesse caused drama this week, I thought he was a comedic presence this week - a relief from the drama. And I found that presence to be quite welcome in an otherwise VERY heavy episode. The only real angst that came out of his presence was Finn seeing Rachel with him at the end. Otherwise, his storyline was the most light-hearted part.
I agree that Finn/Cory has improved dramatically, but outside of Sam, he's still the weakest male singer, imo.
And on a side note, since when do you love Groff, Bill? When his casting was first announced, I thought you were kind of against it?