Plus per clue Michael and Mark are a lead team so if they were U-Turned it would almost have to be the sisters or blonds that have Blind U-turned them don't you think? I could see Jodi doing this .......
It has to be one of the other early arrival teams, K/J or J/C, that would have the ability to U-Turn Mark/Michael. Personally, I dont see that type of behavior in Kisha/Jen, but Jodi/Christie have shown that they have a sneaky nature, ie, in the Leg 1 train ride from Zurich to Locarno. They didn't inform anyone else, that the older lady was going to switch trains and get to Locarno faster.
I have looked back for another reference, but I don't seem to be able to locate it at the moment. Maybe I was dreaming, but IIRC didn't Jodi try to get Victor/Tammy, in some way, hinder another team previously?