As others have said it isn't that easy to just move players on, especially this summer when club are more strapped than usual.
Having said that, I think Pask could still do a job as cover at CB and Allen can do a job CM/AM. Neither are ideal, but in our situation we could do worse. I still think there is a player in Pask he just needs a run of games in a fixed position and confidence, which come hand in hand and I don't think he'll get that with us in the Championship. I always though Allen was a technically gifted player, but he seems to make mistakes on even simple passes, perhaps confidence too.
I actually think Mason could as LB too, but we don't play with full backs and he is injured.
Shame for Shipley being 'one of our own' but he just doesn't seem to have anywhere near the fitness of a professional footballer or the intelligence for the Championship.
I want Drysdale to come good and a few Cambridge associated people I know rated him highly, but I still recall one of his first games for us in L1 (can't remember the oppositon) and he looked really slow, that isn't ideal. Hopefully another L1 loan will help.