In defense of Pep, to give some context and in a strict football sense, at the moment he let Cole go, the kid was a bit too much of a sellfish player and risk taker in his approach, in comparison to the more obedient, yet at the same time talented and incisive but more team oriented player Pep maybe thougth Foden would finally become consistently.
He might also thougth Kevin would still there to be his more wild card alike Palmer and he certainly forgot the sort of stamina/ joker card/ number providers players like Ryan, Julian, young Gundo were for him in the past, to not properly cover those assets in his team.
Cole BTW never looked easy to handle or patient, more when he knows that he has that edge to produce numbers and his confidence (for the good and bad) it's his best trait.
What I find more odd than him loosing Palmer, is his excessive trust on Doku and some other new acquisitions that clearly aren't also in the mold of what he usually asks for his main players. These players, no matter how problematic Cole might be to handle and some tendencies he might have that do not commute entirely with Pep Ball at that moment, never looked for em as promising as Palmer and with even a more sellfish approach in the case of Doku with almost no end product. So I dunno what happened behind teh curtains, but City's post trebble renovation so far sucked