MadamReporter, I've read the Bode DNA reports, and the closest thing to your claim I'm familiar with with is a hair which could be Terry Hobbs' or one of the many other people who share his mDNA, and which is labeled ""Hair from M. Moore ligature"
documented here with no mention of if it was "found in the actual knot" or otherwise. Is there another hair which matches your description, or have you misunderstood the facts regarding the hair in the report I linked? Also, I recommend familiarizing yourself with the phenomena known as
secondary transfer, and noting the variety of hairs with different mDNA noted in the the Bode report I linked that likely came other parents, friends, teachers and such people who traveled in the same circles as the children.