The Houston Texans have had some pretty awful quarterbacks during their 20+ years in the NFL. Debates could be had for the worst-ever Texans quarterback but if someone said they thought it was Brock Osweiler, it's doubtful that many people would argue with that logic.
Osweiler started his NFL career with the Denver Broncos as a second-round pick in the 2012 NFL Draft and spent the first four years as Peyton Manning's backup in Denver. While Osweiler got to learn from one of the greatest quarterbacks of all time, he rarely got to play and never got to start until his fourth year in the NFL when Manning missed time due to injury.