Any time Kevin Thomson has done the H&H live shows, he's said McCrorie is a centre half, so at least one person at Ibrox does!
He's playing midfield at Portsmouth because their style of play will suit that.
If they expect him to be effective in a match with 60+% possession where the opposing team is sitting in and happy not to battle, they'll soon see he's not as effective at that.
I like him a lot, but McCrorie has certain strengths to his game that we rarely get to maximise when he's in midfield.
Just look at what Davis offers in there. He should be better at his stage of his career, but it's pretty clear McCrorie won't become that sort of player.