I'm not sure about Vi joining the enforcers. It may be a good symbol for Piltover's upper class as Caitlyn said, but I'm pretty sure the Undercity is going to see it as betrayal. But I'm very glad that what happened didn't get between Caitlyn and Vi.
I had the same thought about Jayce being part of the council, but he resigned at the end of last season, didn't he?
I wonder if councilor Hoskel ever managed to solve that children's toy Mel gave him.