Lol. I read the first line and wondered what was going on. "What? Why are we talking about Kakashi?"
It's also possible that people with many techniques would be able to beat Kabaji. Kabaji doesn't seem to pull very far ahead of his opponent in the game count. It seems like the match would be very long, but would stay pretty much even. I'd imagine most of his games go to a tiebreak. This is just a theory: If someone simply kept up with Kabaji and went into the tiebreak, they could unveil their secret moves there. It usually takes Kabaji a point or two to catch on. Having many techniques would also help. If Tezuka had waited a little longer to use Hyaku Ren Jitoku no Kiwami, he might have been able to win the game before Kabaji copied his technique.