#4 Seth Rollins isn't ready to make his WWE return
Seth Rollins left WWE on paternity leave following Survivor Series on November 22nd, it was later announced that Becky Lynch and the former World Champion welcomed their daughter on December 4th.
This means that Rollins hasn't even been able to spend a full month with his first child and it's entirely feasible that he isn't prepared to make his return to the company at present.
Rollins and Becky Lynch spend up to 300 days a year with WWE when the company is able to continue their regular touring schedule, and Rollins may not be prepared to leave his daughter so soon after her birth.
It's likely that the plan was for Rollins to make his WWE return this week but the company had to ask the former Champion if he was ready to make his return and he declined. Seth Rollins will only become a father for the first time once and it makes sense that he would want to spend as much time with Roux as possible.