Mollie had only been a university student for one year, and we know that CR had been living in the area for at least four years. Pretty sure he ventured off the farm occasionally. No one is saying she knew him to the extent that they were great friends, or even friends at all. I will go so far as to say that perhaps she really didn't know very much about him, but I believe, in an area the size of Brooklyn, and with the closeness of their ages, and the fact that his baby's mama, IM, who he has apparently been involved with at least off and on for likely some four years, graduated in the same very small class as Mollie's boyfriend, in the tiny high school where it is likely that everyone at least knew everyone else by face, and probably name, there is no way that she had never encountered him. Also, we know IM was at court when CR made his first appearance. It doesn't help CR's case at all to suddenly admit that he knew Mollie, and I don't necessarily believe that IM would offer that information. Beyond that, I don't know who might have been close enough to Mollie to know. And lastly, because LE says something publicly, it doesn't mean they may not know or suspect something else privately, and even with that, they specified there was no KNOWN connnection beyond him seeing her jog before the night of her murder. JMO MOO and all that.