#1. Their WWE friendship could be over if one eliminates the other from the Royal Rumble
Due to the nature of Rollins and Owens in WWE, one will likely turn on the other. Owens might get jealous of Rollins and ruin his chances at winning at the Royal Rumble. Rollins might be undergoing a slow face turn during his Universal Championship feud with Reigns.
If Rollins doesn't capture the title at the Royal Rumble, he will likely be an entrant in the elimination match. He and Owens could be in the match at the same time due to their ongoing storyline.
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For that reason, and the fact that the Rumble is every man for himself, one partner could eliminate the other. It happened on the latest RAW when Rey Mysterio simulated eliminating his son Dominik after a tag team match.
A 'betrayal' or shock elimination in the Rumble could kickstart an eventual program for the Show of Shows. It happened when Reigns eliminated the Undertaker a few years ago. It could happen again this year if Rollins tosses Owens out or vice versa.