I think your talking about 2 different things.
Are positional coaches involved with scouting, grading, big boards or who we pick? No. Not at all.
Certainly not as I've seen some suggested here along the lines of "If Kugler likes X then draft him"
Are coaches involved in other things like visits, private workouts etc as I explained above then sure. They contribute to the big picture in that way.
But they have no direct control over who we take.
We didn't take Gunter because of Buckner. They took him because Keim and McDonough had already seen something they liked enough to set up a private workout and sent Buckner who confirm their opinion.
The scouting process identified Gunter. Not Buckner.