Have you guys seen that the youndaime and naruto are quite alike, they have both the same hair style color, and eyes, also, the seal that was used to seal the kyuuby its supposed to be done in the person that does it to seal it on its body.. and also, it makes the sealed soul and the sealer fight forever while they are sealed....(check the chapters of the manga when the sandaime mentioned it)
ummm,. i have been thinking for a long time and never in the series have been told anything about narutos parents or origins, just that he was a newborn baby...
maybe the youndaime was a genius ninja with a bloodline limit and he knew that to keep a biju as strong as the kyubi it was needed a body with a special bloodline like his, so maybe naruto its actually his son..... thatll make more sense too.
also, theres one thing i dislike of the newest chapters and its that they are making naruto demon like instead of making him grew as a great shinobi, its now more like a fox monster that dont think at all
besides all, the chakra level of naruto in the fight with gara.... he used his regular chakra to do the 2000 clones and also to summon gammabunta, he only used the kyubii chakra in the end to finish gaara...
so narutos blue chakra its actually beyond normal shinobi, but in the newest chapters hes not aware of it and its only relying on the fox chakra, i think he should find out that his power can equal the kyuby and that he should learn how to use it and not to be under kyubis controll.
so far i think theres a chance that naruto has a special bloodline limit that he doesnt know... remember the lighting blonde shinobi on Kakashi gaiden chapters... i think he was the youndaime.. and he used a really special style to move faster than light.. and have a yellow chakra... (umm maybe it was blue... cant know cuz the episodes arnt made yet).
i will like to see naruto fight the kyubii with all his strength inside, in the moment the seal will broke.. and seeing him forcing the kyuby to merge with him.... kinda been the same as always, but hell have formed with red chackra 9 tails only while hes fighting. using his blue chakra to make the rasengan, and a yellow chakra to move as fast as light and control the kyubi inside him, also itll be pretty interesting to see what ability to seal has yamato...
maybe naruto will find a way to control the kyuby without the seal.
so good farewelll
PD, i think most possible narutos related by blood with the youndaime, his son, a relaative.. who knows, or maybe its him ... but narutos power to learn the rasengan and his chakra growth its beyond the youndaime, so most probably, its his son instead of being the youndaime.
)(itll be pretty amuzing if naruto, the boy whos goal its to become a hokage, found out that hes the 4 hokage... hahahah)