This is my pitch for the Reapers:
After one night the Authority is getting beat down by Dean and friends, Kane calls out backup. The Reapers show up and the Authority welcomes them into the fold.
Next week, HHH says he's very impressed with them and will make them full members of the Authority. Luke and Rowan show up with suits (Rowan still has his sheep mask, though). At the end, the Authority ends up getting saved by the Reapers once again.
Then, week after week, Kane is made to look weaker and weaker, while the Reapers are made to look more competent. The Reapers then start inducting directionless mid to lowcarders by giving them sheep masks after beatdowns. First Adam Rose, then los Matadores (or the ascension?), then Bo Dallas. They start appearing next to the Authority in suits and sheep masks.
Kane starts trying to warn HHH and Steph about the reapers, but things have been great for the Authority. Roman, Dean, Ziggler, Ryback and Cena keep getting beat down whenever they start getting uppity. The Reapers reassure triple h, their growing numbers are to serve the Authority better.
Seeing this, Bray tries to claim the Reapers as his own, the cult he's sorely lacking. And while at first he seems like the swerve is complete and it was bray all along, the Reapers turn again and start beating him down, effectively turning Bray Braybyface.
HHH is super happy, so happy he decides to celebrate. Seth Rollins is happy because there are no contenders left, the Reapers have beaten them all down. So happy, he calls for the WWEWHC open challenge. Maybe Cena or Bray or Daniel Bryan come, but they get beat down. They don't make it to the ring.
"I'll sweeten the pot," says Seth, "It'll be no dq! Bring your friends! Bring all the chairs and kendo sticks you want!"
Seth does his laugh, HHH says he's going to win by forfeit. Luke takes the mic.
"Actually, there's a contender right here.". The Reapers take down all of the Authority until there's only Luke, Seth and a ref in the ring. Seth gets beat down by Luke with his own title until Luke pins him. Luke is WWEWHC. The authority is confused.
HHH: "What are you doing? You answer to me! You answer to the authority!"
Rowan beats him down, takes his mic. "The Reapers answer to a higher power now." Lights out, spotlight on the ring, eerie music for Luke Harper and his title.
Reaper's reign of terror with rebranded RAW for a couple of weeks until GODKING BROCK or Survivor Series come to reestablish the status quo.
And if you found that mildly interesting, rest assured that it will never happen.