Rosier has had it drilled into him by Rick not to take chances with passes. He will ONLY throw to wide open receivers but you almost never see a play where he tries to squeeze the ball into a small window. No risky throws. He can't go through a progression and find a third WR. Basically, Rick tells Rosier where the ball goes, if it's not open, Rosier runs. Rick absolutely loves that Rosier is not usually going to make a dumb throw and get the ball picked.
On what planet? He has 19 Int's in 18 games as the starter. And that's including games against non P5.