I haven't paid any attention to this Gundogan rumour because I don't see what we'd do with him. I don't think him and Marchisio could play in the same midfield.
If you were going to put an inexperienced kid into the team it would surely make more sense to do it in the easier environment at home agaisnt Verona. I don't see anything to suggest Allegri is suddenly going to through him in for a tough away game.
Caceres is the more senior player. He has never really put a foot wrong when called upon. His off field behaviour is obviously another matter. Rugani has looked a little shaky in the few chances he has gotten.