Not a sports person, despite being married to one. What does your post mean? Thanks!
It means he look to the 2nd and 3rd plus receivers on a pass, or is his eyes locked to primary receiver
This is a totally football technique issue.
You may recall that when K. came into the league he was very successful. He was an unusually good runner, and a decent enough passer. If he didn’t see his target... he took off, and he was hard to catch.
After a while, coaches noticed that he had a big drawback. A good quarterback sees the field, and sees not only his primary target, but looks around to see his secondary and even his third and fourth possible targets if the main one called in the play is not open. The book on K. was that he would just lock onto the primary target with his eyes, and not take advantage of other opportunities on the field. That made him a lot easier to defend against once it was noticed.
Just running around and throwing balls at targets in a workout doesn’t replicate the game stress of seeing the field. That’s what I was talking about.