#4 Titus Worldwide

Titus Worldwide defeated The Bar in three non-title matches on Raw in early 2018 and it looked like they had a genuine chance of winning the Raw Tag Team titles before Sheamus and Cesaro defeated them convincingly at Elimination Chamber.
Titus O’Neil and Apollo’s days as a legitimate threat to the tag division now appear to be over, especially following their latest losses to The Revival and Matt Hardy & Bray Wyatt, so it wouldn’t be a huge surprise if the duo parted ways in the Superstar Shake-Up.
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Besides, the whole concept of Titus Worldwide was initially so Titus could manage other Superstars, not team up with them, so his first storyline after the Shake-Up could see him trying to recruit new people to his brand.