You have already said that you have almost not watched him, and how could you? There is no reason why you should watch the Norwegian Tippeliga (Premier League), the Norwegian teams (why should anyone else than Norwegians watch them, they are dreadful) and Castilla (for people very much in a sub-group of Norwegian football fans OR Real Madrid fans). That was my surprise at how it's possible to write him off. Because most would not have had the chance to watch him at all.
So, back on track to discussion. I agree, regarding Perez, what they did was wrong. And I believe he would have done it better at Ajax, PSV or Bayern short term. Long term? We'll see. He's again showing signs that he is developing his game further. You cannot put him in the same bracket as Pennant or Bostock, really not. Not even Edwards, who has almost never played vs grownups. The hype was too much though, of course, out of proportion.
Despite all this, I believe, based on having watched him closely since he started, that he is a special talent who will develop into a very good player.