Hi Ann
Sorry to hear of your experience but glad the 'blitz spirit' kicked in and you and the rest of the group had a great time in the face of adversity. As Bob says, there are usually one or two awkward members of any group but when they come as a pair that must have made it even more challenging for you all!
We actually had a mature couple on the National Parks trip last year. They weren't married but were joined at the hip at didn't eat or really mix with the rest of us. They were pleasant enough - we all actually felt a bit sorry for them paying for two rooms and only using one - we suspect that they booked JY without knowing about TS.
However, one thing that did niggle the rest of the group a bit was that our TM got into the habit of putting her clip board on a pair of seats before the rest of the group were allowed in "So that A and B can sit together". Not fair - especially on the optional Monument Valley 4x4 trip when they were reserved 'premium view' seats at the front that the photographers in the group had queued for and missed out on.
Never mind - I'm glad you had a good time, as we all did, regardless.
All the best
Mandy