If this is how his playoffs end, it'll be a good cap on a bumpy-ish season for him. It's never a bad sign when a player picks it up (points wise at least) in the playoffs.
If he can iron out the kinks, keep away from injuries and put all his tools together for some more production; he can be one helluva player. Never having watched a game of his properly, I can't say if that #1D potential is there in any real way. From highlights alone? I think it's possible. He has just about the all the offensive tools. Even if he isn't a true #1 and as much as we're likely going to need a real deal #1 sooner and later, he can be a huge boon for us.
And even if we can't get a textbook #1 from any of Romanov, Guhle, Norlinder, Harris, Struble or Brook; if 3 out of 6 of these guys can hit their ceiling I think we can be in great shape.