Of the 104 qualified pitchers since 2021 there are:
27 Aces (26%)
17 #2s (17.3%)
12 #3s (11.5%)
15 #4s (14.4%)
18 #5s (17.3%)
17 replacement level (16.3%)
If we lower the IP threshold to 200 there are 157 eligible starters and it breaks down to
20.4% Aces, 12.7% #2s, 9.6% #3s, 12.1% #4s, 23.6% #5s, 23.6% replacement