AFAIK there is no grappling allowed in any of the sports LaCanne. Historically, people learning LaCanne would have learned Savate and wrestling for unarmed combat. Vigny taught for a while at E.W. Barton-Wright's Bartitsu Club, which instructed people in the use of the cane, english and french boxing, as well as wrestling and jujitsu. I believe that Vigny intended his system to be effective against multiple opponents, so grappling and takedowns weren't a high priority in his system.