I hadn't thought of that.The only thing I see there is that, supposedly, JK was with Suzie and Stacy at the parties (was Mike with them? Or someone else?)
Why would someone call Suzie's mom if she didn't make it to a party? The way the people at the house reacted so casually on Sunday, the 7th implies to me that if someone didn't show up at a party they said they would be at, people would just assume they went to another party.