#3 Waiting until the night after WrestleMania
We are only two weeks removed from WrestleMania 35 at the moment. The thing is that a lot of the feuds and the storylines have been decided already and everything seems to be set in stone for the big show coming our way.
It may not make sense for WWE to introduce Luke Harper at such a stage, I guess. The company may decide to wait until the night after WrestleMania to bring him back into the fold once again, to kickstart a brand new season.
In a lot of ways, this is the right and the judicious thing to do. He could always come back as a part of the Andre the Giant Memorial Battle Royal at WrestleMania, but unless he wins, Harper will get lost in the mix.
I don't see him winning the match with bigwigs like Braun Strowman involved in it.