I agree its unrealistic to go with the same players for so many games, its not just physically its about them being fully motivated and up for every game they start, rather than them just getting by and maybe holding a bit back for another game 3 days later.
Re McAtee, if he just gave us what he gave us last season and occasional appearances this year, he'd be an improvement on the current impact of Burstow, Dalby and Forss. If he'd played at their level he'd be getting pelters for being lazy or having a funny run.