Inside WWE's hellacious cell structure, there are no disqualifications, and interferences are bound to happen as a result. Surely, the cell door remains firmly locked for the most part, but a pair of bolt cutters can easily override the premise of only two men being locked inside the cell.
Jimmy Uso got involved in Jey Uso and Reigns' storyline on the latest edition of WWE SmackDown. So it's possible that he could interfere during Hell in a Cell as well.
The chances of Jey Uso winning clean are pretty unlikely, so if WWE chooses to surprise their fanbase by putting the title on Jey Uso, it would be a good idea to involve his twin brother, Jimmy Uso, this Sunday.
Perhaps the threat of The Usos together, as a unit, is the only way Jey Uso will be able to outsmart The Tribal Chief of the Anoa'i family. This potential finish wouldn't be too far-fetched since The Usos have been a team ever since they first arrived in WWE, so it would take a lot for Reigns to put both of them down together.