#1. Involve Shane McMahon in the storyline

There is one name that does make a little storyline sense to be involved in all of this - Shane McMahon. Don't forget that it's not even been 2 months since his rivalry with Roman Reigns ended.
He has been involved in a feud with Kevin Owens, but that entirely mellowed down after Kevin Owens apologized and asked for his $100,000 to be revoked. If you think about it, Shane McMahon being the mastermind behind the attacks makes a lot of sense.
He is a McMahon and has been a heel authority figure for most of 2019. There were rumours that he might even beat Kofi Kingston for the WWE Championship, but thankfully, those rumours seemed to have died down.
Still having a grudge against Roman Reigns after Extreme Rules, it would make sense if Shane McMahon was the one who plotted all of it. Erick Rowan would simply have done his dirty work.
While the prospect of restarting the Roman Reigns-Shane McMahon feud certainly isn't exciting, one must admit that it would be a good swerve.
Also read: 3 WWE Superstars who didn't win over Vince McMahon in 2019 and 3 who did
Becky Lynch has been challenged HERE.