Agreed about Fin. Ice-T has obviously made the decision to stick around until the bitter bitter end in exchange for being allowed to do other projects and minimizing his time in NYC winters. (Sorvino has to be pissed that that's an option in the franchise now...) He is content to phone it in and only make an effort when the writers do and toe the company line. I think Kat was added for some more practical reasons - they need someone to run, especially when Giddish is pregnant again, since Carisi became an ADA and Fin is basically Provenza from The Closer/Major Crimes now who doesn't do that sort of thing anymore. Also given that they have decided to renew the show until network television completely collapses they had to face what was obvious to any observer who wasn't writing the checks and add another character - I mean we were talking about how claustrophobic and stale the reduced cast was feeling before they wrote off Stone. It is possible that the (justified) complaints about how the show had become very much unrepresentative of the diversity of NYC played a part, but there were much more practical reasons for adding another detective and Dick Wolf does not pay money for ideological concerns.