In all fairness, one could say that every dual line kite today is a ripoff of the Hawaiian, or Hyperkite, or whatever... After a while, even the patented zipper went up for open improvement and redesign.
Trick is, they kind of "broke the mold" with the functional design... There have been other quad designs not Rev-based, but none handle even close in my opinion... B or not.
I'll leave deeper discussion to others, but the B does represent a lot of evolution and refinement upon Rev flying, although some of it isn't always obvious to intermediate fliers.
Great topic, thanks for posting it Povl, and truly - welcome to the forum!