I am really unsure about Kevin's future role, so I think I'd have to pick "other."
I don't think he'd work at SF.
He could maybe work with Garcia at SF and Evans at PG, but Garcia's not great at SF (in most matchups) either. It might work well against small ball teams, but there aren't a lot of those.
Put Evans at PG, Martin at SG, and someone like Casspi at SF, and JT's going to have to be making those 6 assist games a real habit. And what happens when he needs a rest?
Trading Kevin is one of those things that has to be unpopular, because he's the face of the franchise, seems like a very nice guy, has been cool with trying to carry our generally awful team, and plays really hard (on offense) most of the time. Plus he seems like he really wants to stay in Sac. Even though it might be best for the team, I can understand how people are reluctant to espouse unloading him.
No matter what we do about Kevin, I think there's going to be some pain involved.