#2 Rusev

Another fan favorite who hasn't been used well by the WWE, Rusev is not part of Survivor Series. The Bulgarian Brute got a shot at Shinsuke Nakamura's United States title at Crown Jewel, but lost the match, following which a match between Nakamura and Seth Rollins was set for Survivor Series.
Following the end of Rusev Day, Rusev hasn't had much to do on SmackDown and has no feuds currently. He last wrestled at Crown Jewel and hasn't been seen on TV, but has been on live events. He is still super over with the WWE Universe and WWE must capitalize on it by adding him to the United States title picture after Survivor Series.
It is unlikely that we will see him at Survivor Series, even in a backstage segment, now that the Rusev Day gimmick is over.