bjj was formed from japanese jujitsu, but not in a straight line. judo came from japanese jujitsu, but mitsuyo maeda (the man to introduce brazil judo) was a student of jigoro kano who is, the founder of judo, kano turned maeda over to work with takeda motsuge as a primary sensei, and the founder of kosen judo style (the style introduced to carlos to launch bjj).
bjj is closer in similarities to judo, due to the simple fact of the sporting aspects. japanese jujitsu was not used for sporting it was invented for war. striking, small joint maniplulation, weapon attack and defence, and mant illegal sporting tactics.. ie. groin grab twist and pull, eye gouge, attacking the wind pipe.
i see jujitsu slowly coming up because the growth of sport jujitsu tournaments. it's pretty new and going to one of these reminds me of the old days in the ufc, as in "tkd vs judo"...
"every second your not training, he is..... and he is doing it, just to kick your ass"