#3 Lars Sullivan
Many of you might be surprised to see Lars Sullivan in this list. But, consider this - Kane and Big Show are on their last legs, Brock Lesnar's contract is expiring this year and Braun Strowman (who will definitely become champion in 2018) can't keep on fighting Roman Reign's forever.
With Big Cass being out indefinitely, Rusev and Big E are the only names that come to mind when we talk of big men. But, their credibility is also in question due to the way they have been booked in the past. This leaves the WWE in a fix as there will be no one left believable enough to be challenging Strowman. Enter Lars Sullivan and the problem is solved.
Sullivan is a powerhouse who is capable of destroying anyone in his path and if booked properly as a monster, his matches with megastars like Cena, Reigns, Strowman and even Lesnar could be money makers for WWE. After witnessing Jinder Mahal as the WWE champion for almost half of 2017, we can certainly admit that WWE is open to experimenting and Lars could be its biggest benefactor.