The WrestleMania match for power
The match would have a more creative buildup this way as the company will incorporate various aspects like WCW, Sting and revenge into the mix to make it very different from the typical Undertaker vs. Brock Lesnar match.
Vince McMahon could stand in the corner of Lesnar while Sting will be on the corner of Undertaker. The match be well worked by the creative to hid the flaws and shortcomings of both the Wrestlers. Taker could continue his run defeating Brock Lesnar which means that Sting would stick around running his Nitro.
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This is going to make the second tier show more important and will give a possibility of a potential match between Sting and Undertaker for WrestleMania 31 with a proper buildup.