#2 Keeping Seth Rollins as a heel
Seth Rollins' run as a heel lasted for 10-11 months, assuming WWE isn't continuing in that direction. But the dynamic of SmackDown has changed now, and Roman Reigns has dominated the blue brand as its top heel and Champion for the last six months.
While Seth Rollins' heel run was moderately successful, he couldn't reach the same level he did between mid-2014 to late-2015. That was his peak as a heel character, although the timing of his character change in 2019 was impeccable.
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Seth Rollins returning to SmackDown as a babyface makes a lot of sense. Admittedly, there will be a lot of tweaking that his character requires as a face, and it needs to be a different version of Seth Rollins than the 2016-2019 one.
Seth Rollins being a babyface means that there are a handful of Superstars on SmackDown that he can get a good feud out of. Plus, with crowds not returning to WWE shows until WrestleMania 37, it's a good time to test the waters with a Seth Rollins face run again.