There's a long list of players he's cast aside, including young players he deemed unfit/unworthy...Mou is not a coach who builds for longterm so youth players are rarely his priority...Wasn't that long ago that Hazard made noise he wanted out as well
If your measuring stick is Mou for youth development, how about some young players he's developed then eh?
Far cry from how he'd be a nut for considering another club or that he should be thanking his good fortune that Martinez wants him to stay...This is professional football, young & ambitious talents are coveted by many big clubs so it's only normal that he's weighing his options
Lukaku doesn't see himself as a young player without experience.
“I’m 21 but I think I’m experienced enough now. I’ve played a lot of games and scored a lot of goals and now I want to win titles and become one of the best".
You are right that Mourinho doesn't develop young players that come straight into the first team. However, he does have an understanding of young players trying to make their mark in the game. For instance, he didn't fancy Kevin De Bruyne so sold him and bought Schurle, who is better? Mourinho brought Matic back to Chelsea, who does looks the part, in my opinion.
Mourinho has criticised Hazard, but from the evidence of the world cup, maybe he had a point. Sometimes players don't like it when a manager points out something about their play that needs improving and get the hump. Some take notice and work on aspects of their game that need improving.
Lukaku, like many young players, are bigged up by the football media, on the basis of a few good games or half a season, too many to mention. It isn't that Lukaku would be 'nuts' not to sign for us but he would be an idiot not too.