BREMEN, GERMANY - FEBRUARY 10:   Rusev during WWE Germany Live Bremen -  Road To Wrestlemania at OVB-Arena on February 10, 2016 in Bremen, Germany.  (Photo by Joachim Sielski/Bongarts/Getty Images)
Malakai Black
In NXT, Aleister Black feuded with Seth Rollins and Kevin Owens. After being released from WWE, he joined AEW and fought the likes of the “American Nightmare” Cody Rhodes, but after Bryan Danielson, CM Punk, and others arrived, he slid down the cards quickly, and he’s nowhere close to being AEW champion.
Ruby Soho
After leading the Riott Squad in the WWE, Soho burst into the AEW scene and challenged Britt Baker for the title soon after winning her debut match. However, since then, she has been stuck in a meaningless loop of feuding with the Jericho Appreciation Society and the Blackpool Combat Club.
Jake Hager
In WWE, Jack Swagger won the World Heavyweight title and competed against the company’s big shots in 2010, and when he joined AEW in 2019 as Jake Hager, he had the potential to become something great. Instead, he has been riding Jericho’s coattails since then and has had no singles feud to speak of, acting as a peripheral figure in the company.
Adam Cole
Adam Cole did it all in WWE’s NXT, winning every major title the brand had to offer and feuding with the likes of Tomasso Ciampa and Johnny Gargano. After appearing on AEW, he won the inaugural Owen Hart Cup and even challenged the AEW World Champion twice, but he hasn’t done anything of note since then.
Andrade El Idolo
The one-time US Champ, Andrade El Idolo had the potential to become a WWE champ in the future, which is why his release came as a surprise. Idolo jumped to AEW to seek out new challenges, but he hasn’t made his mark yet, hopping from manager to manager, but failing to find his place on the roster.