SO basically you have no argument other than simply arguing over unquantifiable shenanigans.
My argument is that Jace Peterson has more raw power than Tommy La Stella.
It's ironic and pointless that we're even discussing this, as power doesn't remotely factor into their game.
It's like you don't fully grasp the developmental track from the minor leagues to MLB. The idea that a player is going to reach the bigs with sterling fundamentals is rare. Players have to constantly work on things (taking pitches, hitting for power, etc.) and that can really happen at any time during a career, regardless of age.