This is entirely semantics. Anything above a "mid-rotation upside" writeup is extremely rare even for the best pitching prospects, because for a guy to become a "#1 or #2" guy at the MLB level it requires the development of complementary traits which you simply can't eyeball at the amateur level. Sure, you can take an educated estimate in terms of pitchability, command, poise, consistency, etc. based off of what the amateur is showing to date, but those qualities don't really cement one way or the other until you actually see the MLB package. And even then you can find lots of guys who all of a sudden uncovered these traits after several MLB seasons, like Robbie Ray. Guys who at no point in time were ever considered to have "frontline starter upside" - like Shane Bieber - become frontline starters.
Long story short: when a guy who has Top 10 ability carries a "mid-rotation upside" writeup, it's mostly just for safety purposes because no one can truly project an "ace" except for unicorn-type prospects like Verlander or Strasburg. TJ Zeuch does not belong in the "mid-rotation" category, and he's not even remotely comparable to Hoglund.