Well Koeman and Allardyce are specifically the reason we find ourselves in this position, particularly the latter. He seems to be the type that needs an arm around the shoulder, and neither of those offered that. So yes, we can continue to blame them, it's their doing.
Your point was he wasn't getting the arm put round him, he is now and what went on before should have a line drawn under it. It's just a convenient excuse for people.
What's to suggest he hasn't the stomach for it? He fought for his place at RBL? It's not as though he went there and walked into the team, he earned it. And because he did so, can he really be blamed to see there as a better place to develop his game?
I'm only speculating but going by Silva's comments he's said it's up to the player to show he's ready to play and regardless of the players signed he will play if he's good enough and doing enough, so he's been given assurances he'll play and is getting the arm round him but still doesn't want to be here.
Age is completely a factor. Players develop at different rates. Rooney was ready at 16, Osman at 24. Because he's around the same age as Davies and Richarlison should have no bearing on how we judge him. All that we know is that he has raw talent and we have the opportunity to potentially develop him into a top player.
We've a 50 odd page thread full of people telling us how good he is and using every excuse under the sun to defend him, if he's that good, or potentially that good then he's way ahead of Osman in his development and nearer to Rooney on some people's rating. Every week there's people moaning that he's not starting or in the squad(now and pre RB loan), he's been massively hyped and if anything the pressure's coming from people who rate him rather than the likes of Blarg saying he needs to step up, so for that reason he'll get compared to people of a similar age.
He obviously wants to leave, again Silva said it's up to him to make him happy again, that for me's a fairly clear suggestion that he's not happy at the moment.
I'd loan him out again and see how it goes but I don't really mind if we just sell him and move on, as said I don't remember such small contributor getting so much support. We've too much to look forward to rather than be worrying about Lookman and having Silva asked about him every week.