I actually like Reigns (Khal Drogo). However, there is a way to book him winning without resorting to the Rock coming out for cheap pop.
I would have had Bryan stay in until the last four with Reigns, Kane and Show (if you must). Show hits Drogo with the KO punch but he falls through the middle rope and out of the ring. Then Bryan goes off on the two olds, hitting his moves and getting the crowd pumped. He eliminates Kane or Big Show and it looks like he's about to win when HHH comes out. Hunter distracts Bryan and he's eliminated.
Now it's Drogo and one of the olds with HHH on the outside. Boom. Light's go out and Sting's music hits. Light's come back on and Sting is standing behind HHH who he hits with the Scorpion Death Drop. Kane/Show looks to go out of the ring through the middle rope only to be hit by Bryan (who's been on the floor the whole time). Kane Show staggers and is hit with the Superman Punch and goes out. Drogo wins. Bryan, Drogo and Sting all celebrate in the ring.
I would have had Bryan stay in until the last four with Reigns, Kane and Show (if you must). Show hits Drogo with the KO punch but he falls through the middle rope and out of the ring. Then Bryan goes off on the two olds, hitting his moves and getting the crowd pumped. He eliminates Kane or Big Show and it looks like he's about to win when HHH comes out. Hunter distracts Bryan and he's eliminated.
Now it's Drogo and one of the olds with HHH on the outside. Boom. Light's go out and Sting's music hits. Light's come back on and Sting is standing behind HHH who he hits with the Scorpion Death Drop. Kane/Show looks to go out of the ring through the middle rope only to be hit by Bryan (who's been on the floor the whole time). Kane Show staggers and is hit with the Superman Punch and goes out. Drogo wins. Bryan, Drogo and Sting all celebrate in the ring.