Oh, it's very nice to see a succesful 3c(1 hit) 236a, finally~. And someone actually use 6b, though he didn't follow it up with 5b or 6c.
5b is, in CT, generally slower on recovery than 6a, so the BBL will whiff in places where you replace 6a with 5b.
That said, 6a is slower in CS than in CT, so both might not really be viable options anymore. Need confirmation on that stuff, though, or a video of someone actually landing a late 6a->BBL off of frog.