Mario Manningham made the exact same catch on the opposite side of the field with 2 dbs drapped over him in the Super Bowl....
Off target throws are also a loaded stat when you're working with receivers that are not running the routes that the QB expects them to be running. Is that the reason why all of his off-target throws are missing? No, but it is a contributing factor.
The real problem I see goes farther than just the "Sanchez Sucks!!!!" narrative that many are pushing on this site and in the press in general. Nothing is taken into consideration except there was an incomplete pass or an INT.
Sanchez is not an elite QB or a HOF QB like Brady so expecting him to thrive with 3rd stringers and practice squad players inserted into starting WR roles, and a 31st ranked running game is GD ludicrous