Some of the most enthusiastic and persistent Marlo-bashers are esteemed colleagues of mine. (Hey! We all have our blind spots!)
Many jumped on the Fulvesian Bandwagon that spent an inordinate amount of time trying to build an indisputable case that Marlo was "the biggest, most egregious thief (of ideas)in the history of magic." To boot, he was also one of the most overrated technicians in the 20th century.
The same bashers are equally passionate supporters of the very magicians and cardmen that Marlo consistently criticized and demeaned.
Of course, all of this "playing the dozens" will sputter into silence once the "players" shuffle off this "muchly mortal coil."
In the meantime, I've amassed a large and impressive number of public credits (to other magicians) that Marlo posted over the years. The ratio far exceeds his compeers during the same time periods. I may post this someday.
Researchers, if they have the heart or stomach for it, will eventually sort out the facts from the factoids, the truth from the falsehoods.
Yes, Randy C. is right. (Thanks, BTW) Marlo did credit Downs. In fact, most of the stuff in the Revolutionary Card series was merely finesses and details; differences that make a difference. Marlo only desired credit for THESE things.
Passing Note: In the expanded version of EXPERT CARD TECHNIQUE, the stuff on the Side Steal (Daley) did not make much ado about Downs. Why not?
So it goes...