I edited my two previous posts, because I was not really clear. My apologies.
I mentioned earlier why it was very unlikely for 2D and 5D.
As far as J.D is concerned, since it has less recovery, it might be possible to do J.D < 5C < Zantetsu, it's working in 1.1 with a RC after the J.D or in overdrive. I wouldn't count on it though, that would be way to sweet of a buff.
In the case of 6D, if it wasn't changed in 2.0, it won't work. We'll have to spend at the very least spend an additional star and do 6D < Guren < Zantetsu. But honestly, has anybody ever landed a 6D in CP?
According to the wiki: "You can cancel into Overdrive almost anytime you could cancel into a Special Move.", so that would be highly probable.