I think I've finally reached the point where these lists hold no weight at all for me anymore.
Ethan Conrad had around 500 PAs in college and has yet to face professional pitching.
Moises Ballesteros has 2000 professional PAs, has mashed at every level, including his brief stint in the majors, and is only 8 months older than Ethan Conrad. This without factoring in the possibility that he could still become a serviceable catcher.....