Just a few corrections here, the original members of the Black Flight were:
Raymond Collishaw, ex 3 Wing and 3 Squadron RNAS, 26 victories while leading the Black Flight.
William Alexander, ex 3 Wing, 11 victories whilst in Black Flight.
John Sharman, ex 3 Wing, no
victories whilst with the Black Flight, moved to another flight after just a few days.
Ellis Reid, ex 3 Wing, 19 victories.
Gerald Nash, NOT
ex 3 Wing, 6 victories with the Black Flight.
Desmond Fitzgibbon replaced Sharman, he was also ex 3 Wing, 5 victories with the Black Flight - as far as is known, did not have a "Black" named triplane. He was also not Canadian which probably explains why he has never been regarded as a member of the flight.
'The most celebrated wartime fighter unit of the RNAS'
This is probably more due to Collishaw's hype than fact. Dallas in Naval 1 and Little, Booker & Co. in Naval 8 had similarly impressive results.