Going off of a Frolunda game shift cut up, they seem to have a very Sharks-esque offense. Edvinsson's role was a bit like Karlsson's - jump in and pinch to keep possession in the o zone. I thought he did well carrying the puck up high and down low and dishing it around.
I think he has the highest potential of the top 4D, but also the harder path. (Bigger than Hughes/Clarke, more skilled than Power, but has to show he can use both at a high level) To reach his potential, he would need more strength and seasoning (I think more time in a pro system should help).
But, I'm also not sure that the Sharks would be capable or patient enough. I could see them being happy to have a more skilled Vlasic/Dillon type and stop there. From his size, skill, and U18 flashes, IMO it's worth seeing if he can grow into that top pairing type that controls 200 ft when he's on the ice. And maybe the fall back is a second pairing dman with good size and skating (possibly as a trade piece).