Flynn is a decent enough keeper, but can be caught out very easily, with proper scouting. We got Craig Gordon to scout him, he found his weakness, coming off his line far too much, and then we exploited it.
Brett is nowhere near as good as McGinn, it would be laughable to suggest otherwise.
Armstrong is pretty good, but wouldn't work with Graham - They are too similar, and both too slow to work as a partnership. Therefore I wouldn't have him, otherwise I would have thought he'd be an alright signing for us.
Adamson - Wouldn't get in a left back, and isn't anything too special at centre back.
O'Brien - I can't remember him playing against us.
Stewart - He is a player I really like, and he would walk into our first team IMO.
Linton - Already commented on him.