Why not? Just a hunch?
I may be wrong, but there is only one plume system to my immediate knowledge, and that’s Hawaii. Thus I’d find it odd for one to be so far in from the western continental margins, which have definitely demonstrated active tectonic activity over the past several hundred million years.
Rather, it’s plausible that some or most of Yellowstone’s heat sources are remnants of these earlier - and ongoing - subduction systems...but I’d have to review the geology and geophysics of the region to be more sure.