JB, since you're watching the games...how close does Larsson look?
Here is my quick/gut feeling on Johan.
I like him a lot. I think his defensive/offensive positioning is great. He's great in the faceoff circle. He makes some really good passes and can finish plays. Like Granlund, he gets overpowered along the wall. He has gotten stronger over the course of the season but just last weekend, he had a period where he fell down 2-3 shifts in a row.
As far as how close, I would not hesitate to give him a shot. However, if he was overmatched physically, I would not keep him here long. I think he has offensive potential that he is developing by playing on a scoring line and getting PP time. In short, I think his defensive positioning and awareness would allow him to adapt to the NHL but I worry that he would struggle in the cycle and stopping guys from going to the net. And, if he is brought up now, the offensive potential he has may not develop as fully or at all.
I see his overall development benefiting from staying in the AHL. But, I admit I am more conservative than others with prospects.