The identical account of two people who identify events based on their unpleasant (and therefore easy to remember) memories cannot be ignored. To complete the picture we have photos - this is another argument.
If you could take photos of the second bike (manufacturer's markings !) it would be great.
I've been trying to formys rather than questioning it
So far nothing comes out of it a meaningful picture based on the new data for a few da - Team Panasonic frames for 1986 season and SLX Z566 "demolish" any chronology based on Z1701....