Or he's putting Brock over one last time and going into the hall of fame at mania 32
What would Lesnar really gain from that? He's already beaten the Undertaker three times, as well as eliminating him from the 2003 Royal Rumble to win it.
If Undertaker loses to Lesnar again, it doesn't really put Lesnar over much. He's already beaten him three times, with two of those three matches clean. The only thing WWE would gain from a Lesnar win is a permanent and damaging blot on the Undertaker's career and a LOT of pissed off Undertaker fans that would be baffled as to why WWE refuses to give Undertaker a win over this guy. Furthermore, I'm sure the Lesnar and Undertaker rematch and the 4 hour Summerslam are WWE'S push to get new August network buys... having Undertaker lose on that level just seems too risky. Undertaker is a guy whose name can bring old fans who stopped watching back to watch again, but they won't continue to watch just to see him get trounced again.
Now, please keep in mind that I'm not an Undertaker fan. I'm definitely not one of the people who will have a hissy fit if he loses. But it just doesn't make sense to think that Lesnar gains anything by winning this. Undertaker on the other hand, loses a lot by losing this match. He looks not only bad by proving he can't beat Lesnar, but he looks like a bit of a crybaby by causing Lesnar to not regain the title and coming back after 18 months for vengeance, only to lose yet again.
WWE shits on their workers a lot, but to deal such a blow to one of their most loyal employees and enduring characters is just beyond stupidity.
Oh and also let's not forget that WWE tends to be more rather than less predictable. And having Undertaker win seems more predictable to me.
And I'm just being devil's advocate here. I'm not losing sleep over it either way. If I had a horse in this race, it would be Lesnar. I'm not an Undertaker fan, or even a Lesnar fan really. I'm a huge Paul Heyman fan though and could imagine the AMAZING promos he would give if Lesnar wins.