It was clear in the minors he wasn't a MLB starter, imo. That's where the decision should be made, much, much, earlier. These guys have limited time to throw maximum speed with their bodies, and many waste years in the minors in a role they will never have a chance at realizing in the majors. Jax, imo, was always destined to be a RP (if he was in the majors and successful). I'd guess A LOT of guys are like him. The argument that they should start for 3-5 years and learn to pitch is not, imo, correct. Throwing really hard 3 days a week is very different than throwing less hard once a week. They should learn the latter if they aren't likely starters (though how the minors would then have enough starters, I have no idea).