I think his three ball will improve to league average. Not the first year, but by year 2.
If Fox is your long term PG, I think this team needs dogs who can run up and down the court with him. Having three ball handling guards, who can score on three levels, run with Fox, and play with each other is a luxury not an impediment.
Keeping it simple, would the Kings be a better team with Lavine instead of Buddy? Kings make the playoffs with Lavine. And, of course, if Bouknight is the pick, Buddy is gone. A win, win in my book.