Its a year too early to check on the value of Kings prospects. They have a whole lot of talented kids, but they are relatively the same age and only Vilardi has dipped his toes in the NHL, much less the AHL.
The Kings most likely won't move any prospects until they have a better handle on what they actually have.
Thomas projects as a wing, and his complimentary style of play could just as easily translate as to chemistry with Byfield as it does a 3rd line role. No reason at all to move him.
Wouldn't surprise me one bit to see the Kings move next years #1, but I doubt any prospect among the Kings top 10 or 12 gets moved for at least a year.