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. Sure, but given how good Bryant already was, it was fairly safe to say that he wouldn't get much better (because there's not much room for growth from what he already was) in any tangible way...have better seasons? Yeah, sure that's baseball and player performance varies from year to year, but actually be a better player? Pretty questionable. If he had come in and just been OK and shown flashes, then maybe, but there's not a whole lot of room to be better than a 6.6 win(in 150 games) player. Just so happens (and it looks like this actually happened late last year), KB closed a hole in his swing and actually got better in a meaningful way.