I was having the same discussion at the weekend. I'd much rather see a decent player in his natural position than trying to push someone the manager thinks is better out of position.
Players are getting drilled every day so their positional tactics become second nature. Asking them to play elsewhere after a couple of days' get together is just looking for problems. Both goals we lost in the past 2 games were entirely avoidable and I doubt if O'Donnell, Gallagher or any natural defender would have been caught out the same way.