3. Chad Gable
Let's be honest here, Chad Gable is one of the most underrated performers in WWE. He was one of the most beloved wrestlers in NXT as part of American Alpha, and had the weight of huge expectations when he debuted on the main roster. However, all of this proved to be a bust.
Even though the former NXT and SmackDown Tag Team Champion did put on great singles performances against the likes of Rusev and AJ Styles, WWE still couldn't capitalize on them. After his American Alpha partner Jason Jordan was drafted to Raw, he was paired with Shelton Benjamin, which didn't work for him very well. Later, he was drafted to Raw, breaking up the tag team.
As a matter of fact, WWE haven't given him enough screen time on Raw and, as a result, he hasn't appeared on TV in the last two months. It is quite clear that WWE have lost interest in him at this stage.