#4 Raw is War
A potential match between Lesnar and Rollins could be more than a Universal Championship match, it is a match between two superstars with different attitudes, ideas, and characters arcs.
Rollins is the relentless babyface that will do anything to bring Raw back to its former glory, and Lesnar is a superstar that believes he has proven he is the top dog in WWE, which is why he doesn't waste his time fighting for something he believes he has already proven.
These are two wrestlers that are polar opposites but it seems like they fit perfectly into this narrative together. Its a war for Raw's future, one wants to save it, while another is destroying it, if that doesn't sound perfect then what does?
#5 A narrative completed
Seth Rollins' feud with Lesnar started all the way back in 2015, and at that time we witness the best incarnation of Rollins character, 'heel Rollins.' Rollins was a cocky, brash, overconfident egomaniac that wanted the whole world in the palm of his hand, and for the most part Triple H gave him that.
As World Title wins, Money in the Bank victories and the status of being known as the future of the WWE was given to the man, but after his knee buckled from "carrying the company" on his back, The Authority had no use for him, and they banished him.
Since then Rollins has grown immensely as a character, as he received the forgiveness from his Shield brethren for his betrayal, he got his revenge by beating Triple H, but one thing is still unresolved from Rollins past, and that is his last obstacle to the top in Brock Lesnar.
When Lesnar last faced Seth it was at Battleground 2015 when Rollins was still a coward running from his problems, now Rollins is not running from Lesnar but sprinting towards the man to finally complete his final mission, beating Brock Lesnar.