Excellent. So we can all wait until Mayberry turns 70 for him to get the requisite number of AB against LHP to make an informed statistical decision. Or we can look at his stats now, conclude that he is a pretty good hitter against LHP and use him as a platoon bat and hope we're right.
I swear, sometimes you stat guys throw all logic out the window when it comes to these things just to prove a point. There's no way Mayberry is going to get 2200 PA against LHP. There's a pretty good chance he doesn't get 2200 total PA before he's out of the MLB.
So if you're a stat head going to AA with this unregressed not enough PA nonsense, you're going to get fired for wasting his time. Regress the f***ing thing, then come up with the same yes/no decision as the person looking at his career splits - that there's a good chance he can make a good platoon partner, although past results may not be indicative of future performance.