I guess I don't fully understand your question?
Is this 100% lala fantasyland, where in Natebishop's world, the Blazers get to trade Batum straight up for Durant?
In which case, you take Durant yesterday, today and tommorow. Even, if for some strange reason, Durant turned out to be a terrible fit for the Blazers, you could move him a player that is a "better fit" plus more. With Durant as a centerpiece we could swing a trade that netted the Blazers a very good "glue" player at small forward, PLUS a big upgrade at point guard.
If it is more reality based, then trading for Durant would have to be Batum plus more - a lot more. Say, Durant for Batum and Aldridge. Even that probably would not be enough. Then, your question is, what is a better "fit":
Blake, Roy, Batum, Aldridge, Oden, OR
Blake, Roy, Durant, Outlaw, Oden?
Or, is the thought, what if we took Durant with our draft pick instead of Oden. Then, the question would be what is the better fit:
Blake, Roy, Batum, Aldridge, Oden, OR
Blake, Roy, Durant, Aldridge, Pryz?