Could see that. Hyatt is arguably the best WR on the board and the fact his 40 time was 5th fastest of WRs at the combine likely didn't hurt him especially since he came in with the 6.5 grade (also highest among WRs).
Josh Downs (UNC) is smaller and ran slower.
Quentin Johnston (TCU) bigger WR, but didn't run so not sure if he helped himself or not
Cedric Tillman (UT) has a higher grade than Addison and honestly considering the injury he had at the end of the season his 4.54 official was pretty good. I think he could run 4.4s at his pro day and improve his stock
Jordan Addison (USC) is smaller and ran slower.
So I think Hyatt could be the 1st WR taken because this WR class isn't nearly as good as next year's will be (one reason I though Hyatt was a lock to enter after the season he had).
I think Darnell could fall just because the OL group is so deep. There are 5 OTs graded ahead of him and then 3 interior OL graded ahead of him as well. So unless there is a big run on OT or OL I don't think he goes in the first.
Young I honestly don't know he didn't have insane production which hurt his grade coming into the combine, but he had great numbers and has good enough size. Only Nolan Smith ran faster & jumped higher than Young. He had the longest Broad Jump, one of the fastest 3 cones, and even though he only had 22 reps his bench was still top 15 among all pass rushers (EDGE & DE).