#6 Big Cass

As far as untimely injuries are concerned, Big Cass's luck definitely ran out last year. Cass was rumoured to be in line for a major push post SummerSlam when he was feuding with his former tag team partner Amore.
However, Cass tore his ACL during a match on RAW, and couldn't hide his frustration on live TV.
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Cass was given six to nine months to recover from the surgery and is currently rehabbing his injury at the WWE Performance Center.
He also recently mentioned that he hopes to return before WrestleMania 34, and could make a surprise return during the Andre The Giant Memorial Battle Royal!
Source: https://www.sportskeeda.com/wwe/wwe-news-details-on-big-cass-wwe-return