Re: The Shinigami Seal ... explained in its entirety
Lovely, we see the death god summoning 'twice' 'actively' and a bit passively, and Cash thinks he is kishi on the matter. So far the shinigami summoning seems to be presented as you summon the death god and you get a 'wish' that can be granted. Details involved and ability for wish to be carried out are a different story and seem to depend upon the summoner. Aka We don't know everything there is to know about it until atleast near the very end of the manga. Granted we were both a bit wrong so far on the some subject ( after me reading back a bit ).
" Oro white snake section "
I won't deny the white snake is involved in the whole reincarnation jutsu thing. Oro being a snake is different jutsu. Oro is a human. Granted a human that can do things that normal humans can't do due to forbidden jutsu and such, but still a human.
Won't deny the speeding up the timetable. If it was the part of Oro essence, then apparently it got repaired/replaced with the new body. Shouldn't happen if shinigami can 'only seal away souls'. Even then, sealing away part of essence is admition that shinigami jutsu is more than just 'soul of another person' sealage like the kyuubi.
So now you are saying that the kyuubi is a person? You need glasses?
"Look at how Oro"
So now are you saying that Minato got into ( his ) melee range to 'hold' onto the kyuubi, despite tail slammage, paw slammage, other abilities of the kyuubi, and lord know what else and was able to hold out for the 'entire duration' with the kitsune 'unable / very restricted ability to resist' throughout the entire thing? Especially, when he had a second party to have to deal with.
Also, you misreading my post. I never said that part about sarutobi and scroll part. Though was the option open? Apparently it could have been given all that Minato has going on so far with his version of the method, meaning Sarutobi would need proper scroll ready and what not. Oh wait, wouldn't that be going into details involved, circumstances, ability to carry it out, and what not that you don't seem to want to acknowledge?
" key scroll "
Kishi doesn't always flat out say everything about everything. Yes, it is the 'key' to the 'safe.' So in a matter of speaking, the other half of kyuubi chakra is 'within the scroll' / key. Admitting of this is admitting that shinigami jutsu is more than just 'stealing souls.' Even then, Jiraiya said he sealed the yin chakra using the shiki jutsu. Did he say that he sealed it within the shinigami? No. It is still possible that he did, but most of what we have for Kyuubi's yin chakra is the key scroll.
"split into 2 parts"
I am not denying that it was split into 2 parts. 1 part in Naruto, other part 'somewhere else'. But, mentioning of 1 seal, not more than one.
I'm sorry, is the manga over? No. Then this part is as to it being the only thing is speculation. Granted, it MAY have been the only thing in Minato's arsenal that could do the job. However, he had other things on his mind besides 'sealing it away' like future use of the kyuubi. Perhaps, the shinigami jutsu was the only thing that could accomplish what Minato wanted ( not just sealing the kyuubi as a stand-alone. )
" kyuubi and minato part "
Minato I won't deny due to the nature of the jutsu. Though apparently, he was granted a few 'perks' such as 'saying high' to Naruto. Whether kyuubi ( despite part of it in naruto ) is in shinigami, we have yet to see. Hence, the 'future aspect' that I keep ranting on about. Something else could be revealed about the seal in the future ( especially when/if naruto versus sasuke and/or madara happens in the future ). But, then this would disprove your nice little thread title there and you would have to change your theory around to match it ( which would basically prove you don't know all about the shinigami jutsu ).
"Oro sarutobi version of jutsu"
We saw what sarutobi wanted to do with it. And what is this? Variation? But, the shinigami jutsu is supposed to be just 'summoner's soul being sealed along with another person's soul' . Remember? Not 'summoner's soul being sealed to 2 people and attempt to seal a third only for it to not work out so the summoner is gonna hafta settle for something else that isn't just 'sealing another person's soul ' ' .
"There is a lot more proof for my theory"
Congratulations if there is. There was 'proof' for tengu theory. Legend of the bijuu. Tsukiyomi being 'unbreakable.' Amaterasu being 'unavoidable' / 'unstoppable' . Naruto and Pein being family members ( on another forum that I go to ), not just 'students under same mentor'. And a bunch of other shit. Some have been disproven. Other await being proven or disproven. Till then, we will have to wait and see via the 'future of the manga'. You know that nasty thing that you don't seem to want to admit to.
"cost of the jutsu"
Actually, the cost of the use of the jutsu was your soul being sealed away forever, etc. The rest of that stuff is what the summoner wants. Apparently, what Minato wanted involved 'bending' the sealed away rule which, going by how 4th saved the day and naruto's life, was granted.
Actually, it ain't small non-influential tidbit at all. There are rules governing use of shadow clones. Shadow clone being inside of naruto is admitting that the shinigami jutsu is more than just 'sealing away of people's soul' and says there is details involved, circumstances considered, etc. from the jutsu used. Please stop contradicting yourself.
@shisui: One doesn't need all of one's chakra to summon the death god ( unless your chakra max = 'mp cost' of the jutsu ), but it seems like you need a shitton of it.