I think the Penguins are going to try Smith on LW and just have him step into Zucker's old spot. I know Smith has played much more RW than LW, but I believe he can play LW without an issue. Considering how Sullivan likes righties on RW and lefties on LW, I think that's a pretty safe prediction to make.
It's crazy though, I honestly thought their top-6 last year was the best top-6 they were going to have in the Crosby era. Adding Smith makes their top-6 better than it was last year, he's another Rakell caliber player.