I was just reading manga 666, and wondering! Considering the character of madz, he somehow likes fighting strong opponents, he got excited upon sensing hashirama chakra and refused to fight a clone and waited the original.. He also lately had enjoyment fighting 8 gated guy and waited for more epic attacks! But why he tried to prevent obito from transforming to the other dimension, if I were him I should welcomed fighting strong opponent like naruto! it couldn't be just mistake, kishi is bigger!