I can't imagine the penalty misses are a big factor, I have watched his career quite a bit over the years and I have long believed him to be someone who will not reach his full potential - mainly owing to either lack of ambition or laziness. There's a bit of a clown about him. Early this season, he seemed to have bought into Pep's approach so I still think he can have a long career with Pep at City but depends on him. Like I said before, some simply won't make the leap - I hope he does
Gabriel Jesus is a major question mark, 19 years old and coming to new continent, league, language etc. - far too early to see him as a like for like switch/replacement. He's depth and a future consideration, not an immediate impact player IMHO. If he produces early, it's gravy but the topic of Brasilians moving to Europe too early has been discussed quite a bit on the caf - similar would apply here, patience needed
Kelechi will be given opportunities too but again a young player
I would wager Pep wants to bring in an elite striker like Griezmann but everyone is looking for a player of that profile. I still think a squad overhaul is ahead for this City team, especially where fullbacks are concerned