An unlikely entry, but a possible one.
Cesaro has been under-utilised as of late, following the 'Superstar Shake-Up', as well as his split from Sheamus, and it doesn't appear as though there will be any distinct changes any time soon. After going from stardom and winning the André the Giant Memorial Battle Royal at Wrestlemania 30, Cesaro has not been given many more chances to prove himself on a big stage.
Impressive matches against the likes of Rey Mysterio and Ricochet have recently displayed the raw talent that Cesaro has, which makes it more frustrating when realising that he has not been given a chance to prove himself at the top of the card. Many fans have been desperate to see 'The Swiss Superman' in the main event picture and possibly win WWE Championships, but he has been restricted to tag team performances with Sheamus and empty storylines on one-off WWE shows.
Although highly unlikely, given that WWE has tried to prevent any acknowledgement of AEW altogether, Cesaro could make that leap from WWE across to All Elite Wrestling and become the newest member of their roster.