There are multi-levels in the Affiliated Systems (MLB). There’s A-short season, A-advanced, and maybe something in between for one reason or another.
These levels are to help an amateur to adjust to the demanding life of professional baseball. All in all, tempering one’s self to a marathon of sorts of playing every day, for maybe over one hundred (100) games. Since many of these hopefuls come from the high school and college ranks, where forty (40) or sixty (60) games was the norm, most if not all of these high school and college pitchers have to pace themselves to an entirely different tempo of life. So I wouldn’t see it all that unusual to see some of these player popping out those kind of numbers trying to go full-bore.
But again, pacing one’s self is what the Minors is all about, but still getting the job done. Some do very well in this regard. Mid to upper nineties is not unusual – but, not constantly, pitch after pitch. There’s a pitch mixture of other pitches that doesn’t require 90+. In fact, it’s great to have a healthy guy rear back and howitzer one – but, a lot of these people have to be bridled to pace themselves.
Also in this population are pitchers that are sent down form another level.
These seasoned vets can command those numbers but, for whatever reason, they’re at A level ball to work things out. 90+ for these guys is no sweat.
Another factor that’s often overlooked is the fact that there is just so many slots open at the next level, so talent may be a fact of life for a lot of guys, BUT, waiting for an opening going up is another fact of life.
I’m not sure if I addressed your question.(?) I’m home briefly and I just popped in to read a few comments.