Iowa Cubs have an .868 team OPS at home vs ,821 on the road. I don't see OPS against in any easy to find site, but the Iowa Cubs pitching staff has an ERA of 5.51 at home and 5.20 on the road. Both numbers indicate home park inflating offense by about 6%.
The IL average OPS is .801. The MLB average OPS this season is .731. So league average is ~9.5% higher in this league vs. the majors.
So even if the international League were *exactly* the same difficulty as the major leagues, an Iowa Cub would need to be putting up an .848 OPS to demonstrate that they would be a league average hitter in the majors.
But of course, MLB is quite a bit harder than the majors, as Matt Mervis found out.
Here's a list of every player who has had at least 50 PAs for both the Iowa Cubs and Chicago Cubs in 2023, what they OPS'd in Iowa and what they OPS'd in MLB
Miguel Amaya .929 to .771 (-17%)
Nick Madrigal 1.192 to .710 (-40%)
Mike Tauchman .870 to .775 (-11%)
Christopher Morel 1.156 to .808 (-30%)
Miles Mastrobuoni .921 to ,565 (-38%)
Matt Mervis .958 to .531 (-45%)
If someone wants to take the time to weight that by PAs be my guest, but in the raw that's an average decline of 30%.
So even if he *were* OPSing .900 (which again, he isn't, that's an arbitrary endpoint), that would make him project to about a .630 OPS in the majors.
I'm sure it's fun to think the Cubs are just *so* good as an orgainzation that they have literally a dozen guys in Iowa who could hit in the majors right now but we don't have room for, the reality is it's just a park/league combination giving everyone superficial slash lines.
Of course, the flip side of this is that I've probably been too hard on pitchers like Wicks.