Hi Stationair8
You're right about the "folklore" bit as you have continued the fake news about this case again.
The "Dan Cooper" who boarded the aircraft is not the same person that was mis-reported as a suspect at the time named "D B Cooper" The FBI had no information as to whether "Dan Cooper" was a real name or alias so simply trawled for anyone with that surname and came up with a suspect (with previous history) called Mr D B Cooper.
He was in fact quickly eliminated but the poor reporting conflated the two identities which probly helped the real criminal hide his true name...