He's not insisting on anything. He said it once, and as a scout himself, why wouldn't he be entitled to that opinion? Especially since that's the primary method for his scouting (e.g., "who does this player [visually] remind me of?") And how do you know VJ is much better in every other attribute? I just showed you how they're on pace to have nearly identical seasons in their first two years. If you want to talk about scouting numbers, then let's do that now.
Jackson:
40 yard dash: 4.46
20 yard dash: 2.63
10 yard dash: 1.57
Vertical: 39 inches
Broad: 10.9 feet
Bench: 23 reps
Quick
40 yard dash: 4.50
20 yard dash: 2.53
10 yard dash: 1.47
Vertical: 34 inches
Broad: 10 feet
Bench: 15 reps
I wouldn't say, based on that, that Jackson dominated Quick at the combine. If anything, I'd say Quick has a much faster initial burst. On the field, Quick showed no indication that he can't strong arm a DB (think: SF last year), and his vertical doesn't seem to be hampering him any (think: MIN last year). If their numbers are (projected to be) nearly identical, and Quick has the upside that Snead thinks he has (and he's realizing it), then what's the problem?
Mental acumen, right now, is the only thing holding him back. If he can fully grasp NFL defensive concepts and get in sync with the QB on reads and blitz pickups, then there's no stopping this kid in the next several years. I, for one, have faith in his ability as well as faith in the coaches to get him there.