#4 Bayley
Another superstar that some will argue hasn't been on the main roster enough to justify the word 'complete bust', is former Raw Women's champion Bayley. Not only is her moniker deserved after being out of the title picture for almost a year now, but also by how much her gimmick is holding her back on the main roster.
Whether WWE or Bayley decides to change that fact is up to them and will ultimately be dependent on the consequences of such an action, but she doesn't deserve to be anywhere near the title picture in her current state. In fact, WWE might be better off sending her back to NXT and working with other superstars down there.
At least in NXT, WWE can put Bayley back in front of an audience that absolutely loved her Hugger gimmick and build her back up from there.
In the end, it may not be the answer everyone wants to hear when it comes to how to make Bayley work on the main roster, but its better then continuing to let her flounder like she is.