There is nothing constructive in telling a young player "you are not legend x".
Constructive would be "you didn't manage this time , but you are going to next time ; keep working hard and you can potentially be like legend x in the future".
That's conatructive.
That's actually more than constructive. That's one of the better examples of framing I used with employees whenever they'd f up.
Rather than just slapping themselves upside the head and calling them idiots, you leave them believing that you had much higher expectations of what they're capable of. That they just blew their opportunity to do that for x, y, z reasons but with determination, focus, and effort they are capable of getting it right.
People are 10x more motivated by that than they are the Pep Guardiola School of Avoidance that Eto'o and Zlatan had to suffer at Barça. Motta made even Guardiola look better.
Here's context for you, he's 19 shouldering the pressure of the number 10 jersey, but ignore all of that, this is the only context that matters: did this shit motta pull work on yikdiz or any other player for that matter ?
You can only be measured by results. And given that Juve pretty much continued its club form as a literal sh*t factory that took talent and money at the intake and produced raw sewage, he did nothing to change that.