It was more him saying that players are coming into MLB fully formed these days (and peaking earlier than ever) and that it was likely that what we saw in Bryant his rookie year was all that he'd ever be. When our players develop in significant ways at the big league level, it's far more the exception than the norm and probably a testament to the guys we have and the development staff we have all the way up and down, but - again - he wasn't wrong about that in general. That is actually very context dependent. While it is *fairly* true as a generality, it doesn't take long to look around at the young players in MLB to say that it is very far from a hard and fast rule. For every Trout, there are several like Machado.