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MJF is indeed one of the biggest names of the All Elite Wrestling AEW promotion, and he has also been a wanted man for WWE. Being a multi times World champion in AEW, it will not be exaggerated that he carried the promotion on his back at one point.
Recently, MJF hook about WWE star and former five time WWE World Champion Seth Rollins and claimed that "The Architect" is definitely one of the best in the world right now and his name will be remembered as one of the best ever. While appearing as a special guest on Busted Open Radio, he explained the following;

MJF recently shared praise for Seth Rollins
“I get along with Seth,” he said. “I take issue with [David LeGreca] [calling him a tool]. To be honest, the only reason I haven’t put you through that wall is because I’m very tired from doing all this press. Seth Rollins is a freak of nature. He’s going to go down as one of the greatest faces in the history of that company.
MJF is a former AEW World Champion
“The same way I’m going to go down as one of the biggest faces in the history of my company. When you think of these promotions, when you think of WWE, you think Seth. When you think of AEW, you think me. I find him to be extraordinarily talented. I feel horrible about his knee. It sucks.” [H/T: Fightful]

Seth Rollins is presently out of action with a knee injury
Seth Rollins has been active in WWE for the last one and a half decades, and he has emerged as one of the biggest names of the promotion. His main roster introduction was through the famous faction The Shield, and he was the first wrestler of the faction to win the World title.
Check out the huge TLC match that has recently been added to the card of Summerslam here
At WrestleMania 41, he defeated Roman Reigns and CM Punk in a triple threat match which marked the beginning of a new main event run for him. But unfortunately, he is out with a knee injury presently; however, we can expect him to return soon to continue his main event run.