I got something that I can't figure out... You see, even for Sandaime Hokage/Jiraiya/Oro level shinobi, they still require blood as sacrifice to summon their pets/kuchiyose... How do the edo tenseis (i.e. hanzo and niidaime mizukage) can summon their kuchiyose without the need blood sacrifice as those edo tensei corpse got no blood? Please inform/correct me...
Wonīt look it up now, but I think they use blood as well...the possibility to do this is actually given, because every Edo Tensei is made out of a human sacrifice (so there is blood).
But if they really donīt use blood, I donīt have an explanation!
Seeing how Kakashi stabbed Haku and no single drop of Blood was shred, i dont think they can use Blood
I think the blood is not necessary for all the summonings, only for the contracts types.
There is other methods of summoning (written seals, like tenten, for example).
The jutsu of the fourth is also a type of summoning : he summon himself near the kunai he threw.
He use no blood doing that