According to
ATT, Capt. A.H.Cobby is credited with 29 victories. Of those 29, 19 are single-seat fighters, 5 are balloons, and 5 are 2-seat aircraft.
According to the same book, Major McCudden's 57 victories include 15 single-seat fighters, the rest are all 2-seaters.
Of Collishaw's 60 victories, 46 are single seaters, the rest are 2-seaters. Though I have doubts about one victory listed as a "seaplane". This one could go either way.
Elliot White Springs is listed with 16 victories, 11 of those are single-seat fighters.
All of the above come from "Above The Trences"
VBR,
Al Lowe 'Honourary Canadian Citizen'
"On the edge of destiny, you must test your strength. "
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Billy Bishop