Well you've just named two, John O'Rourke will also probably start and Ruairi Deane if he makes progress from his injury is also a potential starter, that's four straight off. I don't know who is giving you information but some of those U21's will certainly be looked at by the senior management. With Kelly, Cahalane, Walsh and O'Neill all to fully recover from injuries there is a lot of improving in that Cork side.
I don't know why you mentioned who has to come back for Dublin as that's entirely irrelevant to the point I made, i.e Cork aren't as close to full strength on Sunday as some were making out.
Mentioned Dublin players missing as response to your inference that Cork to be a fair deal stronger and that gap to Dublin mightn't be as significant as Sunday showed.
I think a full strength Dublin is a long way ahead of a full strength Cork. Think also there are 2/3 other teams who are stronger in midfield and defensively than Cork which is where things really fell apart on Sunday. No team can lose the players Cork have lost and immediately step up a couple of levels. Kerry & Tyrone finding this reality also.