hmm jiraya's intentions were to break orochimaru's seal, not to weaken kyuubi's seal. now you have me wondering who is more confused lol you or myself. probably still myself.. because you just confused me a little more lol i'll go reread some of the manga.I'm not sure what manga, but naruto only has the ying chakra and not the yang chakra of the 9 tails fox sealed inside him. Jirya had stated it earlier in the manga. And what old man jinchuuriki are u refering to. B/c I'm 100 percent sure the 9 tails was for itachi and the 8 tails was for kisame. As for the seal your refering to, the seal wwas there to trap the 9 tails ying chakra and so the 9 tails couldnt escape. B/c in the early naruto episodes when jirya 1st meet naruto he weakned the seal b/c the seal wsa no allowing naruto to access his own chakra.