How other clubs got on previously is irrelevant, they don't have the same manager, squad make-up, or circumstances as us. The make-up of the division and the relative abilities of the squads is also different from previous seasons.
See, we can just as easily dismiss the facts you spout as irrelevant.
As for what you say about players looking round the dressing room and getting worried because a few players have left is negative and insulting. I think they'll be thinking "I learnt a lot from those guys, but this is my chance to step up to the plate and shine, and I'm going to grab it".
The likes of Dimaio, Osborne, Arthur are absolutely certain to grab opportunities this season.