A Lord Of The Rings Question

Regarding Barrow-wights, they aren't just Barrow-wights. They used to be something else before they were wights (unless they're Maiar). You have suggested they were either Maiar or Elvish wraiths because of the kind of power they seem to possess. I hold however that they are Mannish wraiths, infact wraiths of the Men of Carn Dum (because Merry called them 'men of Carn Dum'.). That's what I meant.

You're mistaken. Merry did not refer to the wraiths as men of Carn Dum.

And there remains no textual evidence to support your thesis that the Istari represented a sub-group of Maiar who were distinctively separate from other Maiar in terms of power.