#2 He could sabotage the Universal Championship match

A departing Brock Lesnar and an overbooked Roman Reigns clash over the Universal championship this Sunday. The chances are high the crowd will take over this match as they did during the WrestleMania 32 main event between Roman Reigns and Triple H.
The Undertaker has legitimate reasons to interfere in this match as both the wrestlers involved have cost the Deadman.
Did Goldberg ruin Bray Wyatt's career? - Watch Now!
Lesnar infamously broke The Undertaker's WrestleMania undefeated streak and Roman Reigns 'Retired' him at the previous Mania.
This could be a distraction or a beatdown either during or after the match, and the ways in which this storyline could be extended are endless!
One wrong move ended Big E's career - Watch Here!