I'm describing him as I've seen him in the SHL and J20. What you saw at the U18s was fools gold against other smaller, junior aged players. Also, while I'm not a Drysdale stan, Drysdale competes 100% harder than ASP. He's also bigger.
Saying ASP's game is 2-way is a mistake. He's about as one-dimensional as a defenseman can get. I know the "his defense makes Hronek look like Langway" is hyperbolic, but ASP is flat out bad at defending. On the rush, in the corners, in front of the net.
If you're looking for a defenseman to generate REAL sustained offense you want to look at guys that are game managers. This is why guys like Keith, Doughty, Lidstrom, Niedermeyer were successful. They could battle off a forecheck, settle the puck down, force the other team to reset or change and either headman the puck up ice or skate it out themselves. That's the same reason why guys like Fox and Makar and take your pick of any of the top 25 D in the league are also successful. With ASP he's not going to weather a forecheck.
I believe your best case scenario with him is Gostisbehere, Torey Krug or Tyson Barrie. Sheltered 5v5 minutes, PP1 guy. Those guys have their place in the league but my preference is for the guys that can actually take care of their own end and you don't have to worry about putting them out there against a top line.