The Denayer new contract and being told he would play, only to sign it and be loaned out with Demichelis having his squad place still stings to do this day. Denayer should have been a perfect Guardiola centre back in every way. We fucked his progression up big time
The further we get from Pellegrini's spell in charge, the more damage he did IMO.
Sidelining and selling Dzeko, Bony over Dybala, Demichelis over Alderweireld. Playing Kun through a lot of injuries and rushing him back. I don't think he managed Yaya well at all on a personal level post 2014, the academy got neglected when there were kids and the team was weak enough that they could have help and that caused Sancho and probably Brahim to leave. Richards shouldn't have been let go for Sagna IMO although I know people won't all agree on that one.