Darragh Cashman would be plenty good enough to get in a team especially early in the season. As far as I know Linehan is not involved however he is a decent player when fit tbf.Linehan has been riddled with injuries since the minor winning team of 2019. I would be very surprised if he is involved at senior level.
I would say of the guys you mentioned, Herlihy and Buckley by far the most likely to feature this year. Cashman was training with the seniors last year, and made a couple extended match day squads, but I would be surprised if he was to force a way through, or even get a proper go.
Luke is with the Development Squad, not the Main Squad.Luke Murphy from Cullen is in with the panel. I would expect the team announced for the weekend to be an experimental one