It's not 'quite* clear' at all, that's just conjecture. Carlos deserves as much credit for the first year as he does criticism for the third and eccentricities are hardly rare when it comes to football managers.
All this shows is that Wallace, like many other players are completely juvenile, take little to no responsibility and are pretty much the kids in a classroom most of the time.
Having heard/watched many other podcasts like this (e.g. Undr The Cosh) many players have told similar stories about far more successful managers than dear, lauded Carlos.
It's also worth noting that McGeady has been interviewed on this channel before, where he said Carlos really liked him but didn't end up playing much, possibly because he was not fit enough, maybe he didn't want to put those 'horror stories' in while he was still playing.