The production of rookie QBs has certainly been hindered by the hands of their pass-catchers. Current drop % (and rank out of 38 qualifiers), per @PFF:

Josh Allen: 7.0% (4th)
Baker Mayfield: 6.4% (6th)
Josh Rosen: 6.1% (8th)
Sam Darnold: 5.8% (10th)
Lamar Jackson: 5.0% (14th)

— Chris Trapasso 🏈 (@ChrisTrapasso) December 11, 2018