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the only person who has been booked strong enough to actually pin Roman is Cody Rhodes.
Roman Reigns could not defeat Seth Rollins at Royal Rumble with his regular match and resorted to getting himself DQ'd.
Cody Rhodes beat Rollins three times in a row.
Nobody else has really done that to Rollins, who is technically speaking the #2 kayfabe power level in the entire company.
Cody Rhodes is the only person who has the storyline and power level to send Roman home