#1 Seth Rollins
Seth Rollins was the handpicked Superstar to replace Roman Reigns as WWE's top full-time Superstar. He was the obvious pick since many felt that he should have gotten Reigns' spot anyway.
Things have changed a lot since then, but WWE had committed to building Seth Rollins in the top spot and even gave him his first World Championship in three years. While he still maintains a high level of popularity, he's edged into the "polarizing" territory thanks to how he's been booked as a babyface and certain comments that he's made outside against WWE fans.
This hasn't helped his popularity and Crown Jewel saw him lose the Universal Championship to Bray Wyatt, who effectively ended the rivalry and took the title to SmackDown where he was drafted in the first place.
Rollins is back to step 1 now and has to rebuild. He has been featured and will continue to be, but if his popularity continues to deteriorate, it wouldn't be surprising to see him lose his push as the top superstar of the company.