I guess it all really depends on where we are planning on playing Buendia. Because if we are playing him at the #10 role, that leaves us only 2 midfield roles for the rest of the squad -- If we go 4-3-3, Buendia drops into that midfield 3, and would play as the #10 in the 4-2-3-1. Plus McGinn is undroppable in Dean's eyes.
If we're playing him on the wing, like Jack, then it would make more sense but we'd still have to figure out the #10 role with both Traore & Buendia being "key" signings over the last year for that right wing position.