#3. Dominick interferes and helps Rey win
During the season premiere of RAW, Lesnar interrupted and not only attacked Rey Mysterio, but also hurt Rey's son Dominick. It was shocking, to say the least, as Lesnar made it personal and clearly crossed a line. Subsequently, Lesnar defeated Cain Velasquez at Crown Jewel and has continued to assault Rey and his son.
At Survivor Series, the father and son duo could have something up their sleeves in order to ensure a victory. Rey could take the beating and endure while Lesnar becomes frustrated. At the opportune moment, Dominick may come out and interfere in some way, which could allow Rey to capitalize and defeat Lesnar.
It would be extremely shocking and would make sense in terms of the story. Until now, Dominick hasn't gotten in any offense on Lesnar, but this would be a believable way for him to affect the match.
Furthermore, Rey Mysterio winning the match in this fashion would be way more believable than him defeating Lesnar clean.