With all due respect to the sambo leglock game. Not every sambo school or every sambo player is very good with leglocks or even ok with it some school focus a lot more on throws and armlocks.
also it will take some time modifying the sambo leglock game to the gi bjj game.
To me the hidden gem of sambo is the standing/gripping game, wich crosses over realy well to bjj.
Sambo is a GREAT art but differs a lot more from school to school than bjj.
hope you find a great school.