Since 1997, only three rookie quarterbacks have attempted at least 200 passes with a completion rate below 50 percent: Donovan McNabb (49.07 completion percentage, 216 attempts), Ryan Leaf (45.31 completion percentage, 245 attempts) and Craig Whelihan (49.79 completion percentage, 237 attempts).
Mitchell Trubisky is on pace to attempt 240 passes, and enters the Bears’ off week having completed 47.5 percent of his passes. If those numbers hold up, that’d be an odd group to join — one of the NFL’s most notable quarterback busts (Leaf), a future Hall of Famer (McNabb) and an anonymous former sixth-round pick (Whelihan).