#2. WWE may not have another star of his stature
Roman Reigns, as we mentioned, is the biggest full-time star in WWE. Seth Rollins is perhaps the second but he still isn't on the same level as The Big Dog. Apart from just the live audience and the kids in the United States, fans need to realize that children and people across the world watch WWE and they are very much believe kayfabe without holding strong opinions like we do.
They practically worship Roman Reigns as a hero and he is second to John Cena in many major markets - such as India, for example. Since WWE really pushed Reigns hard for the last three or four years, it's clear that he became a massive star.
A top AEW star just called one of his colleagues 'spoiled' and 'narcissistic' HERE.
WWE may intentionally not make a star of his level or they may simply fail to do so, depending on who they choose for the spot.