I think the main issue with Kean is his movement/a real lack of game intelligence.
Rom had it at his age. Dom did, to an extent, he's always had it -it's his finishing which has let him down.
Kean's game intelligence yesterday was poor, up until that missed chance. He actually made a really good far post run for that, gave himself enough room to meet a good cross etc.
After that, though the chance was a bad miss, he at least started looking lively.
It's difficult for him when he comes on late in a game to impact things, like on Sunday, but his decision-making compared to Dom or Richarlison is nowhere near.
But that doesn't obviously mean we should give up on him. We've got one of the best Italian managers and the lad clearly has talent - even if he is very raw (which at 20, most players are).