If I am the WWE and they want Wyatt v Undertaker which is to me a 100% snooze fest, here's how I'd do it. Keep having Bray do these cryptic messages but keep it very, very odd. Almost as if it doesn't point to the Undertaker at all. I'd do this for the next two months. Then at Wrestlemania have Bray come out for his match and say, if you are here, then come meet my sister, drop the lights and gong. I wouldn't advertise taker at all.
This allows for a last second swerve for a three way of Rowan, Harper, Wyatt. And if Taker can compete he comes out.
If taker does, I have Taker win. At Wrestlemania, I have a gong segment in the Brock match and have Taker appear to signal for the 2016 Wrestlemania with Brock. Taker wins and then in 2017 goes into the Hall of Fame 23-1.