@Yazen- Doubt that's the weakness based on Oro's version of ET, since both the 1st & 2nd regenerated spontaneously during Oro's fight with Sandaime after taking hits.
Good call ivanov, but I can't see that being a sustainable solution, since it requires the use of a specialized jutsu only a limited group of people would know, and since it requires perpetual chakra use to maintain the binding.
the rock ninja in kakashi gaiden could turn invisible.....
There is an A rank camoflouge jutsu as you mentioned. The rock nin used it as did Kabuto himself as recall in the forest of death. Granted i think that was anime only. Still that is more about blending in. This jutsu of Muu's is clearly something different and of a higher level.
Much as i love seeing these kage. I really want to see the shodaimes. Not expecting much out of Gaara's father either since they claim the sandaime kazekage was the strongest ninja in sand's history.