Yes, I had thought that - makes for a fairly strong reserve side in that case!So if you don’t start on the Sunday for the first team then you can play reserve on the Wednesday. Presume it would be the same for Cross boys from both panels.
Some going to be able to field teams in all 3!
I know Errigal Ciaran in Tyrone field a 3rds team in the Junior league/championship, with their senior reserves playing in the reserve league. Their 3rds even have/had a reserve team playing Junior reserve!