If something happens to *ahem* clear up some cap space, I expect him to be a 13th forward who is often scratched. Vegas believes he has more value than to be given up on waivers and he has shown some flashes of quality.
They still have the hoard the assets view of the world. Maybe its just a slow start but feels like the 4th line hasn't been a force so far. Could just be the matchups, but realistically if they can't drive possession and be able to occasionally go neutralize a better line on the other team, then this idea of paying so much for Reaves and Carrier becomes wasteful and worrying about keeping Kolesar seems a bit overdone. But it seems this organization just values this type of player and line more than most and it aligns with their dismantling of a fast team and replacing it with a more deliberate team.
I think he's at best 25% likely to get taken on waivers, he's basically 13th forward at best on some teams and taxi squad or AHL depth on others. He can't be in the latter two so its a small pool of potential poachers out there. And even if he was lost, all he figures to be is a style fit. They could easily rely on other players to fill a fourth line spot (Jurco, Brown, Sikura), but they are so enamored with this style of game for the 4th line they just can't let him go.