#1 Lack of top stars in the Universal Championship picture beyond Bray Wyatt and Braun Strowman
If you look across the length and breadth of the WWE SmackDown roster, do you see very many stars beyond Bray Wyatt and Braun Strowman who could mix it up in the WWE Universal Championship picture? Matt Riddle may rise to the level of Bray Wyatt and Braun Strowman someday, and yes, Jeff Hardy could have been a worthy competitor had he not snuggled into the Intercontinental Championship picture with the only other name one can think of - AJ Styles. The arrival of Roman Reigns into the thick of things just shakes everything up quite significantly indeed and now both Braun Strowman and Bray Wyatt will be baying for his blood.
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The Fiend is going after everyone that he's had an issue with thus far, and Bray Wyatt vs. Roman Reigns was a legendary feud. So were the many clashes between Braun Strowman and Roman Reigns which effectively put the 'Monster Among Men' on the map, so many years ago.