I'm watching it as I type; it's to the final fight portion. I think it's been one of the best episodes, and I think there's a reason for that.
First, BJJ lends itself nicely to the show format. They didn't have to invent the rules for the final fight; they had them. And they're used to teaching quick, relatively intense clinics for visitors (all those MMA guys, etc., who go to Rio for a few days or weeks for a BJJ "tune-up").
Second, they matched the opponents much better. Instead of putting the hosts against black belts/advanced students who have to hold back in order to make a decent show. Or are just being forced to deal with a rule set and training scenario that's unfamiliar. Jimmy fought a purple belt; similarly ranked, and it was a good match. Dog's fight was also against someone with more or less comparable skills.
Finally... they didn't end up falling back into MMA/kickboxing/jiujitsu as they often seem to be doing. (Jimmy really needs to learn to throw a straight right and a hook that isn't an invitation to being KOed...) Of course, that may be because it WAS jiujitsu...
