The only link we have is that Michael and Randy were both at the water works, and that Michael seems to know Randy. We don't know if they saw each other there, or even if they were there at the same time, or if Randy was turned when Michael was there.
My assumption of a link mostly has to do with we know they were both there, Michael seems to know Randy for some reason, and every time Michael tried to tell us what happened he somehow get interrupted, or distracted. And nothing has been revealed about what happened, or how Michael got out, that is a bit of a hole in the story.
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