You'll never get the best out of mcGinn if you play him as a 6 and that has been of Delano's primary limitations, he tried to accommodate as many of his best players even if it meant not being able to get the best out of them.
I hope to be proven wrong, but I really can only see us going with a midfield of a 6 and 2 8s, which would mean two of Ings, Watkins, Traore, Buendia and Bailey would be sacrificed. If we go for two 6s I can really only see Luiz and Nakamba there, but would McGinn work as a 10 in the prem?