10. Bill O’Brien
O’Brien’s place on this list is unique because he actually did have some success with the Texans. But he dragged the franchise down into the depths of despair. The problem was that Houston gave him too much power. They made him the GM as well as the head coach. The power seemingly went to O’Brien’s head. Finally, he ran the Texans into the ground.

O’Brien enjoyed six winning seasons out of seven-and-a-half total seasons with the team. But this doesn’t tell the true story. Firstly, the AFC South was extremely weak. Then, he sealed his fate with bizarre trade decisions. The decision to send DeAndre Hopkins to Arizona in exchange for David Johnson and a second-round pick was so strange. This alienated blue-chip QB DeShaun Watson. Finally, the Texans fired O’Brien after a 0-4 start to 2020 (via SBNation).