Very rarely I have seen someone learn to be accurate. Honestly I cant think of anyone off the top of my head who has done it. Completion percentage doesnt matter. Where are the passes being thrown? If you throw short little passes it is far easier to complete those over 25+ yd passes. Getting back to the most accurate I have seen in Marino I look at the QB competitions they had back in teh 80s and 90s. HE would hit those long crossing targets routinely and that one in the back of the golf cart representing the corner route.
Obviously Andrews is the guy he is most confident in. But now Andrews is eating double teams taking him away much of the time so he better get comfortable with his other weapons real fast. It will only get harder to be productive if he doesnt.