#4 The heels win the match with a dirty trick
Baron Corbin, Bobby Lashley and Drew McIntyre do not mind taking the low road to pick up a victory. And so, there's always the possibility that the trio will resort to something despicable to pick up a win. In my opinion, this is the only way that the heels win the match.
There is almost no way that WWE is going to book The Shield to lose their big comeback match. Unless that is, that the heels cheat to win the big one. Even this is not a very possible scenario, considering this match is the story of The Shield and not a makeshift team that will split up soon after this match.
The only reason that I can see the heels winning is to build Drew McIntyre back up again. He is a big get in WWE's eyes and the company has big plans for him.