Apparently gambit was cast in X2 (but only as a small role like Beast, Collosus, Jubilee, whatever else)... And apparently he was in a scene, but it was cut (and maybe it will be in the DVD)... And gambit's name (I forgot what it was... Something LuBeau or something?) was on the computer when Mystique was searching through it in Stryker's office or whatever...
http://www.stuntscanada.net/james_bamford.htm
look for "X-men2"...
*shrugs*