Re: Santa Bill
As far as him being responsible for her abuse, I don't think he was around often enough for that to happen. Patsy relates to Haney that he showed up at their house the year before with a gingerbread house not wearing the Santa costume. Patsy: "...and I looked at him and I am going, 'what are you doing here, you're going to spoil the surprise.'" He told the kids he was Santa's brother. Maybe things changed after that but it doesn't seem he spent much time around the kids if they primarily knew him as "Santa," not Bill. Haney asks, "Was she ever alone with McReynolds?" and Patsy says, "I wouldn't say alone, no. I mean we had a Christmas party going on with other people all over the house, kids, you know, and -- alone, no." I wish she'd answered more generally as to whether he had opportunities to be alone with her in the months prior to the party. But Patsy's testimony plus the fact that he was primarily there to be video taped doing his Santa act* (so: little opportunity to sneak away) and his leaving early after being escorted around by his wife all night (due to supposedly being frail from his recent heart surgery) makes me think him molesting JB during the party is highly unlikely. Which raises the question: if the prior vaginal trauma (estimated to be at least 72 hrs old iirc) was indeed evidence of molestation, and Santa Bill is the molester, when did he have the chance? And how frequently could he have done it to cause two of the other major pieces of circumstantial evidence of sexual abuse: trips to the doctor for vaginal irritation and the wetting/soiling problem? If it was someone outside the family, I'd put my money on someone with more frequent access to JB.
But that's the thing that always got me about the molestation issue. The Ramseys were so determined to deny it ever happening as an unfounded attack on their character when it could just as easily have been pinned on one of their friend-suspects. There were tons of people with access to JB, and given the sexual assault on the night of the murder, wouldn't it stand to reason that if someone they knew was responsible that they may have had previous sexual contact with JB too? So why dismiss it out of hand? For example, JB's (odd) habit of calling anyone in to wipe her would have provided ample opportunity to a potential molester. Patsy expressed concern to Pam Archuleta about JB being "too friendly" and "flirting," so it seems like the idea that someone could take advantage of JB's "friendliness" at least crossed Patsy's mind. Yet, despite accusing plenty of friends and acquaintances of the horrendous crime of killing JB, they never considered that any of those potential sexually sadistic murderers previously molested their daughter. They were too busy trying to distance themselves from the charges.
About the question of when the McReynolds' left in relation to the 911 call, I don't have my copy of PMPT with me but I was just reading the section about the party the other day, and I noted that they left before the 911 call happened, I think within 15 - 30 minutes. Seems coincidental to me but ymmv.
*Courtesy of ACR: ""I had not planned to have a family Christmas party in 1996, but Bill McReynolds called me on the twentieth. He told me that Charles Kurault and his "On the Road" television program were going to be in Boulder and would be filming him as Santa. Bill wanted to include our party in the filming, if possible, and he strongly encouraged me to have the event. I agreed." [Patsy DOIpg95]" So to me, it's not all that weird that he wanted to include the Ramsey party, since he'd been to them before and it seems Patsy goes all-out for her Christmas events (eg, the tour of homes 2 years prior with specialized Christmas trees in every room; in fact, Patsy says he said the reason he brought them the gingerbread house was because he thought since "you all were into Christmas" they'd appreciate it), or that he wouldn't stay long. It was the first time his wife accompanied him to an event (she didn't even have a costume, iirc) because he was in poor health. But again, ymmv.