Hmm, so Susan claims they hadn't married yet. What was the marriage date Butter got from the HI index? Wikipedia says Feburary 2, 1961. That's hardy springtime. You're right, none of it makes any sense.
Didn't Susan also say that Ann had visited someone else before her?
Here’s a link to the VERY confusing marriage index data:
Which has NO DATES.
“...Didn’t Susan also say that Ann had visited someone else before her?”
iirc, Susan’s story was that SAD had borrowed a car from a friend of her mothers - no names - and had driven the borrowed car to visit.