#1 - Bobby Lashley will eat the pin

Now, the most important reason behind inserting the Dominator, Bobby Lashley in the match between Dean Ambrose and Seth Rollins is that WWE does not want any of the latter two superstars to eat a pin on WWE TV. So, the best way to book a defeat for either of the two is by having the third person eat the pin in the match.
Dean Ambrose has not been pinned clean ever since he has made his return to WWE, while Seth Rollins, as I mentioned earlier, is the favorite to win the Royal Rumble and so, the Creative team may want his character to look as strong as possible ahead of his match with Brock Lesnar.
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The Lunatic is the favorite to walk out of the match as the winner and without a doubt it will be Bobby Lashley who will eat the pin in this match.