Don't want to re-tread old arguments, so I'll just say I hope your right, and Larsson's first pass is all we needed in terms of an upgrade on the backend to get our offence going.
Our biggest weakness by far/bar none, is keeping pucks out of the net. Passing/transition is a huge part of that of course. We need more goals as well obviously but it's our goals against that has sunk us in the standings more than anything else.
Team defense, from wingers winning battles for face offs and getting in on the fore check down to our goalie making timely saves. Our team on paper is waaay better in that regard than it was to start last year.
A Larsson or a Harmonic type minute munching in all situations is exactly what the team needs to win. The jury is still out if Larsson can do that in Edmonton but by most indications it should not be a problem for him.
A two way defenseman with non elite offense, but elite defense, is far preferable in the Oilers situation than a One way elite offensive type. IMO. And elite two way defensemen just don't get moved and typically cost an arm and a leg. Which Larsson still has a decent chance of becoming.