Hoary (Arctic) Redpolls

The number of Common Redpolls Acanthis flammea present in southern Ontario has been increasing in recent weeks and now Hoary Redpolls Acanthis hornemanni are being seen with more frequency too. This mixed flock was visiting a feeding station in Beaverton, Ontario on the 30th of December. Specific Redpoll identification still challenges me, but I think it's pretty clear which two birds amongst this group are the Hoarys! I will even be so bold as to say these appear to be birds of the hornmanni subspecies or Hornemann's Hoary Redpoll.There are also some larger, darker coloured and heavily streaked birds here - could these be of the subspecies rostrata or 'Greater' Common Redpoll?