Yeah, I see where you're coming from, and I'd be lying if I said that part of the reason I think the 3rd would be my primary focus is that I'm not seeing any great options in the "top-6 play driver" category. I also think we're long at wing and short at center, and it's pretty clear we're sheltering our 3rd line a bit, depending on how you look at it (i.e. that it's just as true to say that we're playing a strong 4th line way more than most).
Playing driving has as much to do with matchups as anything else, so having 3 lines that can press in the offensive zone can solve that so long as they're good in transition. We've got good wings, another coming, and a guy or two in the press box and on the farm that can pitch in.
Our top centers are both considered 1b types at best, though I think we have every reason to be happy with them. Wouldn't mind adding a third that can swap up and down the middle, bolster the 3rd, and allow us to roll 4 lines with no worries in the postseason. Adding a play driving wing would be great, but it'd still be bumping a skill guy down to the 3rd to languish offensively with Eller. Not sure I see the virtue in that unless that new wing is a real star, and a real star will require subtraction from what's currently working.
So 3C feels like the spot to focus on to me. Depth wins Cups.