I may be wrong, but I didnt read Redrogers post as to say that the photo of the man may actually be Samuel Ayres, more that there was a slight resemblance, and, as Samuel Ayres had Webb ancestors, then maybe Samuel and tbe person in the picture may have had a common ancestor.
Remember too that the person whose attic these were found in would have had ancestors via female lines (his mother and paternal grandmother, in fact three out of the four of his grandparents) who would not have been Webbs, and the photos may be of one of them. Just a thought!
Is there anything at all on tbhe back of tbe photos to give you any clue?