[sixtiesmuscle]

Seems to me that emotions & opinions sway some more than the simple FACTS of the situation that existed in 1969. The temptation to rewrite history is great to protect the integrity of the Cannonsberg Yenkos. The undisputed truth of the situation back "in the day", was that:

Don Yenko agreed that Jack Douglass could sell the Copo cars he striped in Hinsdale as official Yenko cars. He set a high price for his authorization, probably equal to what he would have made selling cars shipped to him.

Douglass, as the official, authorized Yenko dealer, sold them to the buying public as Yenkos.

They were, at that time, [and now] Yenko cars.

Whether they are worth more or less than the other Yenkos, only time will tell. That's for any individual, properly informed buyer to determine.
The comparison to Baldwin Motion or Motion prepped cars doesn't apply directly. I'm still waiting for someone to weigh in on the comparison of the Nickey/Bill Thomas similarity to the Yenko/Douglass relationship.