1. Brock Lesnar
This could be the lock according to insiders and it makes total sense. Both are on part-time contracts so they can have, effectively, a two month feud, not bother anyone else and have a cracking match. Also, there is history there in the WWE with a particularly intense and violent storyline which ran from 2002-2003 which also contained a particularly bloody battle in the Cell. Add onto that the apparent personal heat between the two (highlighted back in 2010 when Taker called out Lesnar after the latter's painful loss to Cain Velasquez). Everything is in place. The fans would love to see the speed and brute force of The Beast versus the straight-line power and storytelling of the Deadman. It might be the personal issues between the two though that stop the match happening. These are two powerful men, one in the locker-room the other via his contract, and if one decides not to budge on how the story plays out, it's likely that negotiations will break down rapidly. Again, it all makes sense for the company but the clash of these massive characters, over ten years after their first meeting, might be a bridge too far for Creative.