I wonder if one issue with Frost is he doesn't fit what they're looking for in a center.
In Torts defensive scheme the center is used like a 3rd D-man, that doesn't play to Frost's strengths (or Hayes).
In this case, size, speed and defense is more important than playmaking ability for a center.
It also allows you to play undersized wings who are offense first, like Atkinson, TK, Brink, Michkov, Barkey and Ciernak. Rizzo would also fit that mold, if he gets moved to wing. The wings have fewer defensive responsibilities.
It makes it easier to draft, top two way centers are almost impossible to find, but undersized, skill wings are far more common.