That's exactly it, I know it's a bit of homerism in all of us but Percy Harvin is still very much (?) as is Clay to some extent. Does he have the ability to be dynamic, no question. Like I said previously, look at the Falcons going into 2012. Turner was a top 5 back in the league in 2011. Roddy White was a top 10 receiver and Julio Jones was a top 15 receiver as a rookie in 2011. Gonzales was a top 5 TE in 2011. Now Douglas doesn't really scare anyone but it's arguable that those 4 would scare a DC more or at least as much as Watkins, Woods, Clay and McCoy or Watkins, Harvin, Clay and McCoy.
Put all 5 on the field and it's tough to choose, IMO, who is scary mostly because I'm not sure how much Woods/Clay scare a DC as opposed to White/Gonzales at that point.