I wouldn't link this trade to any plans the Kings might have for the draft. The FO stated that they wanted to get better defensively, and this a good step in that direction. But with Dalembert only having one year left on his contract, and no guarantee he'll be resigned after this season, the trade certainly wouldn't preclude the Kings from drafting another center. Considering that at the moment, Dalembert is the only true center they have on the team.
Also, I don't think the trade means anything in regards to whom they might draft at the center position. Monroe is an offensive player. Cousins is a better offensive player that is also a better defensive player, in my opinion. But if you wanted to read something into it, I would say its sends a message to Cousins agent that he's the man of the future with the Kings. No guarantee he'll be there though.. I think the Kings just got a little bit better. Good start..