#2 To drop the Championship to a rising star
I have been a fan of Rey Mysterio ever since he put on those incredible matches with the Cruiserweights back in his WCW days. The man still moves as nimbly and swiftly as someone half his age and can perform at the peak of his ability.
But it is no surprise that the man is closer to the end of his career than the start, and this match too was a 'passing of the torch' in a sense. Whether or not you liked the contest, a brand new star was born in Rey Mysterio's son and I have no doubt that he's destined to become a big-time legend someday.
It makes more sense for Lesnar to run through his opponents and drop the title to someone like Drew McIntyre than losing to Rey Mysterio at Survivor Series. At least, that's my personal take and quite possibly, Vince McMahon's point of view too!