He’s also very athletic, quick and fast... this is a 4.5 linebacker
Well he didn't run at the Combine. Pro Day times are always less reliable, but he did run a 4.56 at his Wisconsin Pro Day. Calling that a 4.6 forty seems reaslonable, and 4.6 is a fast LB no matter how you slice it. Sub 4.6 is very fast. So yeah, I agree with yout point. His Vertical is 38" and his broad jump was 123" so he does have some explosion.
But watching the film, I just don't see him winning 1v1's on the edge. I see him getting schemed opportunities, which is a strength of this defense, certainly, but not sure he offers much more to the pass rush. As an off-ball LB, he has some ability in other areas … which is nice. But ultimately, we needed 2 or 3 edge players. At most, we found 1. I'm not convinced Van Ginkel can beat out Kiko Alonso or Jerome Baker, who are his direct competitors. Heck, Chase Allen is likely to be a direct competitor this year as well … so fingers crossed it is a good competition, because we need to find some edge rushers or this defense isn't going to look good in 2019.
One thought I had was that the lack of edge rushers was intentional. It really goes a long way towards tanking if we have no pass rush. Call that what you will, but we could have had Chase Winovich, the better version of what Van Ginkel offers, or Zach Allen. Both of those guys were available at the end of the 2nd, and both were among the last of the top tier edge guys. Now we're relying 100% on scheme.