I would keep Seddon and Casey. Think Seddon has shown enough for a new contract and Id be more than happy to see Casey sign on again. Also don't see the point of signing players just to punt them out on loan although I'm aware it does happen and it happens both ways - Balmer might have his faults but don't really see the point of putting him out on loan particularly as he's only contracted for another season - theres no value to us in putting him out on loan for the last year of his contract. We would get zero from that scenario - he might as well be a squad player for us than going elsewhere.
I get that someone else might pick up a proportion of his salary and free up wages for other players - just not convinced that's the best way - but will obviously depend on our new manager whoever that is