#2. The Undertaker
This might be the most surprising addition to this list and surprisingly so. We wouldn't disagree with you if you argued that the "new" Undertaker should return sooner rather than later.
The argument has valid points, as he's returned with a gimmick change - something that he's needed for years. The Boneyard match he had against AJ Styles was undoubtedly his best in seven years and while some believed this to be a result of the editing done for the match, there were many more aspects to it that made it the match that it was.
With that said, should The Undertaker return for the next Saudi Arabia show or even SummerSlam? There are plenty of exciting opponents, but the question comes up as to how frequently he should appear.
Having a pre-taped match is different from a live one and he's unlikely to face a Superstar of AJ Styles' caliber from an in-ring perspective. Maybe returning after a year would serve to help him and protect his change in character.