Recent KHR
What I don't understand about this Arcabaleno challenge is Tsuna's group will pretty much dominate everyone else, except for the Simon family. Not only does Tsuna's family have the box weapons from the future that no one else has, their rings have already been upgraded in the last arc of the series. Let's compare that to, say, Varia. Time line-wise, the storyline is probably about two months after the Ring Battles. If Varia already lost to Tsuna's group from that long ago, how on earth can they compete with these new and improved kids? Or even worse, Kokuyou! Perhaps Mukuro's better, if he has the upgraded rings (which probably was left with Chrome), but Ken, Chikusa, and M.M. are exactly the same as they were before. How can there be any competition?