#4 The Undertaker
The Undertaker is always going to be a possible winner if he is involved in the Rumble, but with his part-time status, it's unlikely that the WWE would use this match as an excuse to give him a title shot when he has enough sway to just come in and demand one.
Every year, people talk about the possibility of Taker retiring, and every year he keeps coming back and performing at WrestleMania. Many questioned the decision to end his undefeated streak at the event, but now that a few years have passed, it doesn't seem like as big of a deal anymore.
Pitting him against the WWE or Universal champion would give someone a chance to face one of the greatest wrestlers of all time at the biggest PPV of the year. Even if they lose their title to him, anyone that the Deadman faces will get a boost.
Him winning would generate a lot of chatter, but The Undertaker is still a longshot to win, with there being so many better options out there.
However, if he is planning on hanging up his boots after this year, WWE may want to give him a proper sendoff with a Rumble win and a big match at WrestleMania.
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