Bringing another post over from
@Momofthreeboys in response to my comment....
[We've all had the same questions about the girls' trip and BM's. Would LOVE to know the answers.]
["My guess is MM1 and her GF. It was right after exams ended. Macy probably wanted to go or her sister wanted her to come. If it is coincidental to Suzanne’s disappearance it is also coincidental to an end of the college year exams road-trip getaway. One of mine would leave for a rafting trip right after spring exams. Barry seemed vague about the trip but I think Suzanne had the details and she dropped MM2 off in Gunnison according to documents. I also suspect they had to have asked the girls about the trip and if it was anything Barry had suggested investigators would have jumped all over it as one more piece of evidence."]
Barry seems to have been in control early on, IMO, as he always has been and I'm not so sure LE knows who planned this excursion at all.
He didn't necessarily have to PLAN it so much as to suggest it. I think we know it wasn't a church arranged trip.
Didn't Barry's sister go along with them (Shirley?) or was that simply a rumor?
"Barry seemed vague about the trip...?" Say it isn't so. "..but I think Suzanne had the details...?" Did not see anything of the sort.
Suzanne dropped off M2 to M1. That's all we know for sure.