1. All three of these guys are reaches and that means poor value.
Just looking at Dillon, when you talk about a 2nd. round running back needing to drop weight for better explosion (I see it more as quickness to the hole which might be the same thing), it's hard to see value. As for big play potential, he's a straight line, tunnel vision guy into the 3rd. level.
As a 2nd. round running back he should be ready-made to carry the rock within the system.
2. Does this look like an outside zone runner to you? Not me. Maybe LaFleur reckons that's too hard to run with this O-Line. Whereas you might expect some clean-up on the receiving and pass blocking end of things ordinarily, I actually don't have a problem with his receiving. His few catches on tape shows a pretty natural catcher of the football.
Here's his game log from last season. See who he feasted on and who he didn't:
https://www.sports-reference.com/cfb/players/aj-dillon-1/gamelog/2019/
Now, might he make more hay than Williams in short yardage with our 3rd. round blocking H-back
in front of him? I wouldn't doubt it. But you don't need a 2nd. round pick for that.
I have no problem taking a QB, a between the tackles power back or an H-back. Just not at these spots, and not these guys at these spots.