Hi Terence,
I can understand that there can be several claimants to the naming of a figure. I can't challenge, Alex, with him no longer being with us.
I first got to know about the Whisk when he wrote an article about how the Whisk came about, which was published in the 'Ballroom Dancing Times'. At that time Carl Bryant was still alive.
I met up with Alex, that year, when he was booked for an adjudication for the East Coast Championships, which was held each year in The Spa Ballroom, Bridlington. Of course, I mentioned his article about the Whisk and the name Carl Bryant was never mentioned.
If Carl, had been drinking when he danced the Whisk, it could have been a development which he called, 'The Fallaway Whisk'.
I have noticed in the book, 'Latin-American Dancing', by the late Frank Borrows B.Sc. that a figure called, 'Mambo Whisks' is written. Whether this term was taken from the ballroom whisk I don't know. Regards.