I'm considering a lot of things when I deem someone a "true ace". Consistent performance, stuff, age, statistics, dominance and how they compare against other arms etc.
I also stated that there aren't many pitchers like Crochet or Skubal and arms like that are tough to come by. So yeah it's not like 15 or 20 teams are going to have an arm like that. Or heck even 10 teams. There aren't many teams that have arms like Crochet, Skubal, or Skenes. As well, there are some arms who I would rank ahead of Gausman, though currently on the IL or missed time this season such as Cole, Wheeler, Sale, Burnes, Bieber, Woodruff, Greene, Ohtani, Snell etc.
Gausman in 2024 and in the first half of this year wasn't looking like a "true ace" at all. I did state he turned things around in the second half but that doesn't erase 1.5 years of slight regression which is what we all saw. There was concern earlier this season that the Jays had no true front of the rotation arm given the struggles and regression we saw from Gausman and Berrios earlier.