not really, well slightly...
JDS is with team Nogueira and Bigfoot with Blackhouse. They do train together on occation, but somehow the teams are seperate. Kinda like Grudge Training Center and Jackson's MMA.
That's the impression I got anyway.
Makes sense! I wasn't sure, just thought i'd read something about it in the past :P. It would suck for Big Foot to have to fight JDS after Overeem beat him