Since this change is due to her having sex with him she is probably scared what would happen if she does it again (can she unGrimm him again for example).
I too am expecting it to be Vega. I like the way she has taken the love/friendship lead with Wylie. He has been shown to have the hots for her but has been unable to do anything about it. Suddenly she is the one who is doing the pursuing. Now that Wylie has what he wanted, killing her is going to be a shock for him.
"Only thing I didn't quite get was whether the unsub actually killed himself, or if Rossi did (put his gun down to lull the guy and then picking it up again and shooting him)." It was a shoot-out. Both had their guns next to them. Rossi taunted the unsub into killing him (kill two agents). When the unsub took him up on the "offer" and went for his gun so did Rossi. He needed to end the case (after 40 years) and not let the unsub escape justice again.
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