Chair Shots: Who should be the Undertaker's WrestleMania 31 opponent?

There's only one man I want to see the Undertaker return to face at WrestleMania 31 in California this year.
And it's the man who beat him last year to end the Streak: Brock Lesnar.
Rumors have swirled the Undertaker may make his annual sojourn to WrestleMania to fight the guy many have tabbed as his heir apparent, Bray Wyatt.
Excuse me while I yawn.
Without the intrigue of the Streak, watching the Undertaker fight and possibly put over an up-and-comer isn't what I want at WrestleMania. What I want from the Dead Man is a dream match type scenario.
You know, kind of like what it would be if he faced off with Sting, who finally made his WWE debut back in November.
But barring a real shift in the narrative, that doesn't make sense this year. Sting absolutely must face Triple H at WrestleMania. And Sting needs to win.
Sting also needs to come back for that dream match next year with the Undertaker in Dallas, Texas (the presumed site of WrestleMania 32), which would serve as the Phenom's retirement match in his home state.
But back to Lesnar. With the Streak conquered by the Beast Incarnate last year, I cannot fathom in any storyline a match involving the Undertaker where he does not seek revenge. Heck, if you recall in 2011, after his first (second) WrestleMania match with Triple H, the angle the following year for their rematch was that the Dead Man was upset he won the match but had to be helped out while the Game walked out.
Having the Phenom wrestle again, especially against a Wyatt or even a Sting, without addressing the elephant in the room that is Brock Lesnar, is asinine, even for WWE.
Of course, this all assumes the man behind the Undertaker, Mark Calloway, even wants to wrestle again. Many has presumed the Streak was lost last year because he was retiring.
Lesnar would probably have to drop the WWE Championship at the Royal Rumble for this to work, although it's not necessary.
Personally, I wouldn't mind seeing the Undertaker defeat Lesnar for the title, then vacate it the next night on Raw, claiming that having vanquished the Beast and bring the WWE title home, he can finally "Rest... in..." before Sting interrupts him, siliently challenging him to a match at next year's Show of Shows. However, the same can be done without the championship involved.
While, at some point, I thought the best use of Lesnar would be to drop the title to an up-and-comer like Roman Reigns at WrestleMania, it's clear that Reigns might not be ready. Or maybe he's just not the right opponent for Lesnar -- for some reason I think fans might be more receptive to a title match with John Cena or Seth Rollins, the only two seemingly with a shot to win the belt between now and WrestleMania.
The return of Daniel Bryan, however, could lead to an incredibly compelling David and Goliath story the likes of which we really haven't seen to this magnitude in professional wrestling if he were to challenge Lesnar for the championship in the main event. After all, Bryan-Lesnar was allegedly the plan for SummerSlam, before Bryan was injured.
Either way, I don't want the Undertaker to be used as "just another guy" at WrestleMania to put over Wyatt, or even to go over Wyatt, which would serve even less purpose. Nor do I want WWE to twist the plot from the logical storyline of Triple H vs. Sting.
The Undertaker, if he's going to be part of WrestleMania, must face Brock Lesnar one more time.

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