In your opinion.
I see nothing to suggest he was as good as he was in his breakthrough season.
You can literally name tons of player who haven't improved - Macheda, Ravel Morrison, Walcott there are absolutely tons.
Which is why I judge a player with what I see with my own eyes - if Kean is strolling around the pitch like a drunk fan im not gonna overlook because I hope in 2-3 years time he may be better - even if he is better how do you quantify that? Better as in world class better or an extra goal a season better.
Feel free to judge a player how you do but lets not pretend its a proven formula as it really isn't.
You hope whereas I go with what I see.