Ohhhhh I gotcha. Yeah that seems really ambitious to me and not at all how the Penguins like to bring guys along. Which honestly is a tad too conservative to me (and a big reason they likely haven't developed even third and fourth liners to this point... they hardly try) but I don't see them giving him a spot then unless he just overwhelms them. And though I wish it he just doesn't seem like that dominant a talent.
Then again one year CAN change a lot. And if we are really to believe that he spent most of last year working on adding layers to his game then next year could be quite the breakout.
I think it's hard to say what the Penguins do as Dubas is brand new here and Sullivan hasn't been part of the decision making on a very talented juniors player here since... well, okay, he hasn't. If you look at Toronto, they've been somewhat aggressive under Dubas. Both Knies and Nick Robertson played playoffs in D+2 and Sandin split time between Maple Leafs and Marlies in D+2.
As for Yager as a talent... I don't think he was that dominant in his draft year either. I'm not betting on it. But as
@CheckingLineCenter said, he looked like he could be that dominant in D-1. And you said it about what could be the breakout if he's the player he was in D-1 only more rounded and better.
I cannot emphasise how much I wouldn't bet on it, but it's fun to dream about. Pickering was never going to be an early breakout because he's a giraffe growing into his body. Poulin had a moment where it looked like he could before the mental health problems took over, but it didn't look like he'd so as more than a useful complimentary player to begin with.
Yager, I think there's something to maybe dream about. I don't think anyone knows who Yager will be this season, I'm still not super high on the pick given the wide variety of scouting reports on him, but the best version, the best highlights, the way he can go and go and the way he can finish, wow.