Learn to be a premium defender? Give me an example. I'm not sure I've ever seen anyone learn to be a good defensive outfielder. Angles are not something that can be taught imo. Acuna will be an absolute stud bc he can mash, but he won't "learn" to be a great defensive outfielder
So, you think his development is done? He's a finished product just a few months after being rushed to the majors? All premium defenders are made, not born. This is a very difficult game to master, and it starts with premium physical tools. From there, it's up to the player and the coachng staff to refine the tools into usable skills. It takes an insane amount of hard work... I have no idea if Acuna will actualize his god-given physical gifts, but he certainly has a chance.