It was a consensus top ten pick before the combine, he ran a 4.8 and fell on mocks and rankings
I wouldn't look too much into his combine speed. He's quick (very good initial burst), but not fast, which is more important, in my opinion, as a front line player. If he's having to make plays 40 yards down field then we have a whole separate problem. The guy takes great angles on the ball and is very rarely beaten.
It was a surprise pick for me as well, and I love the pick, but I think he has the skill-set and athleticism to play standing up or with a hand in the dirt. I think the comparison to Suggs is more accurate than the comparison to Krueger. A pass rusher who can play the run.
I think he suits this "hybrid" defense very well and can very well be an every down player. Walden? I don't him having enough of a pass rush skill-set to see him being an every down OLB.