Rich was reportedly very upset that he could so easily destroy Krupa in this drum battle... Krupa was his lifelong hero. Rich even took it easy (anyone who knows his playing can see that).
Krupa *was* rather old and not exactly in his prime as a drummer, but check out those vids of Rich at age 65 playing the best of his life. Krupa was a ground-breaker, but not nearly the drummer Rich was.