How I think the opening night roster will look like

I don't see any evidence or even a hint of an indication that Greenway-Hartman-Foligno won't be a line, and certainly that Fiala would be with Hartman and Foligno. Those former three have been together for the duration of camp/pre-season (barring games where they're not all playing). Fiala is going to be with some combination of Boldy/Beckman/Gaudreau/Pitlick/Rask.

Truth, but I really think that Fiala should be on a second line.

I don't think "second line" and "third line" matter here. If you want, you can just list Fiala's line as the second line regardless of who's on it. Each line has their role. And even last season when Fiala was on the "third line", he was third in TOI/g, 9 seconds behind Ek, so it's not like he's not getting minutes.

This he deserves a better chance. But i separated what I want with what is going to happen and created a separate thread for that.

Beckman deserves a shot before Boldy IMO.