I'm not sure what you mean on Thomas. Power forward is a style of play, not a position. It's not one he is suited for as skating and vision/passing are his strong suit not physicality.
As for Kyrou at C, it is unlikely. The C has the most defensive responsibility. And that responsibility is a lot less straight forward than for a wing. The C is covering for everyone, and as such is most likely to be caught in the wrong position. Kyrou is improving defensively, but it's a work in progress. No need to add additional D-zone responsibilities on him. It's why we are trying Buch at C, because he is a strong defender at wing.Its why people prefer Schenn at wing because he is not as strong a defender.