Sorry @super_ram, beforehand if this is something you disagree with.
Frank Lampard only succeeded at Derby County at a point where their chairman was spending money, and wanting to buy young Premier League talent as a way to force themselves back into the Premier League. Mel Morris, seemed to start off with good intentions but quickly seemed to enjoy rubbing shoulders with the bigger players/clubs. He reminds me of Alan Hardy to some extent. Although, one I would say is Temu and the other Wish.com (Morris/Hardly).
Lampard had good foundations at Derby, an ambitious club, and he managed to use his connections to bring in good players from Chelsea on loan.
Jumping to Chelsea was the wrong decision, and that has impacted his career ever since. Everton seemed a sillier decision considering how they had dropped off since selling players like James Rodríguez, and the downfall since it is largely due to Lampard being the wrong appointment.
I can't see him succeeding at Coventry City, not even if he has his uncle Harry Rednapp on speed dial.
I don't have any sympathy for him, he seems to choose clubs based on how desperate he is and how big of a club they are. He doesn't seem interested in working at a level where he could truly learn and improve over time. Being a good player doesn't make you a great manager. To some extent, I feel the same way about Steven Gerrard.

Manchester City aren't undefeatable. They are a great league team, but even with all their spending, they struggle in Europe and that's their true measure. I think a lot of English clubs are figuring them out and have game plans that allow them to be more expressive and restrict what City can do. I wouldn't be surprised if there's more going on behind the scenes, but I haven't heard anything. Not even rumours, which I would imagine there would be.
Losing five games on the trot and then following it up by blowing a 3-0 lead at home is pretty extraordinary, especially when you consider that City have wiped the floor with the Premier League for the last five years or so. Against Spurs they were lacklustre and second best in every department. I don't mind it at all as it's about time we saw another name on the trophy, but you do wonder if there's been a bust-up behind the scenes.
A note of caution though: they remind me a lot of Bayern in Germany. Every season, they tend to have a poor run which is seized on by the press and everybody talks about the Bayern "crisis". They then bounce back and win the league regardless because nobody can touch them. I wouldn't bet against City doing the same.
Big match for Pep today as Man City meet league leaders Liverpool at Anfield. Another defeat will put Pep under even more pressure.