I don't worry about Lias. He can "languish" in the bottom six until the TDL. Let him learn to bang around and work hard and learn the ropes of playing a full NHL season. He's NHL-ready, and while it would be great to see him in a big role, he can still learn things and contribute playing with lesser players like Fogarty, Strome, Gettinger, McLeod, Nieves or whoever else comes up, etc. He's not being wasted. You can learn from those tough minutes and from practice and from watching the play unfold before you on the bench.
And then, at the TDL or whenever they're ready to give him a bigger role, he can open it up and build on what he's learned to that point. The great thing about Lias is that he's very smart, his instincts are great--he's got a nose for the goal and impeccable timing. Those aren't things that are lost by spending two-thirds of a season playing a lesser role.
So, if they move him up now, awesome. If not, he'll be completely fine. What he's doing now will help him in the long run.