As reported earlier on this site (and any moderator who feels it best to move this to a previous post of mine about the original music for this number should feel free to do so – I can’t find it now myself) the ‘pas de deux a trois’ first appeared in something like the form we know nowadays from gala programs and competition appearances in choreography by Samuil Andrianov in a 1915 Petrograd CORSAIRE staging. (Maria Bababina, the musical advisor and dramaturg in Munich spelled out the particulars with regard to music used and Andrianov’s choreographic previously noted on BT.)
These scans of Maryinsky house program copy from 1915, specifically from Jan. 12th, show that the number, a ‘“pas d’action”,’ came sixth in the production’s breakup and included Karsavina’s Medora, Andrianov’s Conrad and [A.N.] Obukhov as an unnamed character – presumably the ‘Ali’ we find in today’s CORSAIRE stagings. (Earlier in this scheme, as a third number, a ‘Pas d’esclves,’ Obukhov danced opposite [E. M.] Lukom – also a character unnamed in the principal casting.
In addition to this look at the casting, I’ve also scanned one of the lovely Munich house program’s illustrations, this one showing the Jardin Anime, which Doug had a direct hand in staging for Act 3.