Kane is a great goalscorer. No doubt. And a great player. However, with his skillset, mindset, mobility issues, and injury proneness, he is a player that poses some crucial challenges:
1. If we keep him, we need to build a team that works around him. As it stands, we do not have such a team. He has been at his best when we have had a high press, with creative passers with goal-scoring potential behind him. Last game he had four of his five offensive team mates barely able to pass at all, and full backs with average delivery. He needs the high defensive line, because he does not have the physicality or mobility for being a target man or for running behind. He is at his best when he can use his quick head to read opportunities and move intelligently on break downs. If we are gonna surround our striker with types like Son, Moura and Bergwijn, we'd almost be better off playing a type like Heskey or Llorente up top.
2. His mindset is bad for the team. My impression is that many think that a striker should be selfish and focus on scoring goals. I do not agree. At least not when they get as obsessed as it seems like Kane has become. It is damaging to morale when players become too selfish. Kane claiming the Eriksen goal a couple of years back seemed to make Eriksen pissed. What is probably worse, is that it leads to waisted opportunities, like when Kane decides to take direct free kicks - they are all face-palmingly horrendous, or when he doesn’t pass to team mates in better positions. If Kane had played the game like de Bruyne, he could have been almost equally good at passing - as he has the technical ability, the intelligence and the creativity for it - and a better shooter. He'd be fantastic had he been less selfish. The team would have scored a lot more goals, and have been harder to defend against.
3. One of the failures of Poch was that he seemed to train our players away from mobility to strength. Players like Alli, Dier and Kane all seem significantly less mobile now than they did a few years back. Others bulked up too. If it is true that Kane now weighs 89 kg and is 188 cm, his BMI is 25.2 - he is overweight. Had he been a target man, one who'd bully defenders and win and control long balls and clearances from our defence, it might have been ok to be that heavy, but he really isn't. Defenders seem to have very little problems winning fights with Kane. He would be much better off being a bit lighter and quicker in his step.
4. Injury prone players are always a bit problematic. But when a main man, a most important player, is injury prone, it really hurts a team. With Kane, with us needing to build the team around him, with the difficulty of finding proper backup for a striker of that format, particularly as we only play one up front, and with the time it takes for him to get back to his best post injuries, his injuries are devastating. Getting him back is almost worse than losing him to injuries, as it is like playing ten men for the first few games after his return. I used to think that Aguero and Yaya were problematic for City back in the days, because of their frequent injuries and how dependant they were of the pair. I argued that Liverpool should sell Coutinho before they did, as he was their star and missed almost half of every season. That despite the three mentioned finding form faster after injuries than Kane does.
Kane IS great. No doubt. But he might actually be more of a problem than an assett as things stand. If we had been a bigger team and the squad was built correctly, things would be different. Right now we are in a position where he is bigger than the club, where his personal goal records chase seems more important than the success of the team.
But we can not sell him.
Which means we are either fucked, or we need to rebuild smarter, change his state of mind and retrain him into a slimmer, more agile version of himself.