#4 The Fiend has too much momentum right now
In WWE and wrestling in general, it's very important to strike while the iron is hot. That's exactly what WWE did successfully this year with 3 Superstars - Seth Rollins, Kofi Kingston and perhaps most importantly, Becky Lynch.
It worked because WWE made sure to protect them in the most pivotal moments of their push and they topped it off by giving them a well-deserved coronation. At this stage, all three of them have lost momentum in some form or the other (except for Rollins), but The Fiend Bray Wyatt may be the hottest star in the company now.
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It helps that he doesn't appear week after week on television and also that they don't overexpose him or even have him wrestle that often, for that matter. The Fiend has an incredible amount of momentum behind him now and that's only going to increase drastically over the next few weeks leading up to Hell in a Cell.
WWE knows what they have with Wyatt and they know that they can't simply allow Seth Rollins to pin him or even beat him, period.