#4. The re-emergence of Seth Rollins' weak knee
Seth Rollins' knee injury is something that hasn't come into play since WrestleMania 33. Pretty much the night after, things seemed to be fine and it was never mentioned again. However, from late 2015 up until then, it had a lot to do with Rollins' knee buckling under pressure and a terrible ACL tear that put him out for months.
When talking to Calgary TV recently, he was asked about why he needs multiple curb stomps to win a match. He gave a kayfabe explanation, stating that his buckled knee is the reason why he doesn't get full impact on it.
With Bray Wyatt no-selling the curb stomp, the story is undoubtedly going to be about Rollins' weak knee that he suffered from in 2015-16 and a small part of 2017 as well. Expect The Fiend to exploit the knee and for it to be a key factor in the storytelling of their match-up.