Yeah, comparing across eras is hard. Man o’ War carried 130 pounds multiple times as a 2 year old. Secretariat et al didn’t. But while I think Big Red the original is still de mostest hoss, I don’t deny that others were also great horses.
I met John Henry and have a picture of me with him. He knew he was great. No question in his mind.
Whether he ever does or not, I don’t think Arrogate would have trouble with 12f.