Some of this will sound sort of familiar.
I woke up at 4 am this morning, and had a thought. That thought was how Cena could return.
Lets say this Bryan/Corporation feud is still going on for a couple of months, as Bryan is still chasing the title.
He's gathered a team together to take on the Corporation team at Survivor Series. Now, I know Cena said four to six months, which means two or so.
We can have Bryan, CM Punk, Big Show, Ziggler on a team.
Randy Orton & The Shield on another team, with HHH in their corner.
I'm thinking that you have Bryan as the only member of his team left, and one of the "Shield Guys" and Orton left.
They are just tagging in and out, the ref takes a bump, that sort of thing. All hope for Bryan looks lost.
Then "SQUEAH DEAH NEAH DEAH" (Cena's intro music spelled phonetically).
Crowd goes crazy...hopefully.
Cena hits the ring, looks like he's gonna AA Orton, turns around and hits it on Bryan.
Instant mega turn. Wakes the ref, and makes the ref's arm count to three. In the middle of the ring with Orton's foot on Bryan's chest, HHH, Cena & The Shield standing tall.
Now, this could lead to a problem of, well...then who does Bryan go after? I didn't think that far.