Not enough room in the backcourt to play all those guys. If you are going to keep drafting guards you have to be willing to trade your best ones because trading small for big is hard.
Monte has shown that he understands this and has the balls to do it. Trading Hali would have been extremely tough for him, given his play, his desire to be in Sacramento, his personality, the love we got for once for drafting him, but most of all, since he was Monte's first pick. Yet he did it when the opportunity presented itself. In hindsight it was the right move.
We have a similar situation again. This time, trading Fox makes the most sense. Keon and Devin are low priced high value assets. Fox is also likely to get the best haul. Plus, if we focus on the future, instead of the immediate, the trade can help us build a long term contender while keeping the costs reasonable.
The trouble is that we don't know if Kings have indicated that they are open to trading Fox (there are whisperings, but might just be some media types blowing some smoke). Nor do we have any insights into what offers we are getting, if so. Unless there is an offer which makes lot of sense, it's better to wait till draft day.