One thing is certain. Naruto has not met EMS Sasuke yet. You need to check your facts. Second, the toad sage said that Naruto will
fight a young man with power in his eyes. This is at least what the translation below says:
This translation is the same for most of the scanlator I have seens so far.
First, I think many people have misunderstood the expression
Sync with the Gedo Mazou. In my opinion, all the akatsuki member could sync with the mazou during the sealing of a biju. That is how I see the syncing with gedo Mazou thing, and it is more reasonable than thinking that Obito who does not even trust Madara will give a boss role to Sasuke who is a betrayer to everyone he meet. Besides, you can notice that your argument contains of speculations in order to make Sasuke a hosts.
Second, the elder toad never said that Naruto will die. If I am wrong, I ask you respectfully to bring a link to your fact. I might sound rude, but don't be mad at me. It is just that I don't know how to answer when people use argument that does not exist in a discussion.
Third, the fact that Naruto and Sasuke will clash was not a prophecy. It was Obito's own opinion when he was thinking of himself as a god. I even remember Obito saying he know all the extent of Naruto's power while being confuse about a sweat. He could even not notice what happen between Naruto and the Bijus in the second sphere of consciousness.
So I think taking Obito's prattling for a prophecy might end just in the a similar disappointment to what happen to Kabuto's fans.
Fourth, it is quite interesting that lately, many people wants the eyes of the SO6P to become a Jinchuriki. In my opinion, becoming a Jinchuriki is not made sucuessful because one has a body. The greatest factor is that one can have a loving self that is necessary to control the Biju, least the Biju take your body over due to hatred. Thus I think if Sasuke or Madara becomes Jinchuriki of the 10T, they will just have their body taken over by the Biju.
==================== My Opinion on the young man with power in his eyes ===
Pa and Ma used to refer to Jiraya as
the little Jiraya, or Jiraya boy. In one discussion, I asked a fan to give me his best guess of the age of the great elder told. He could give a shot, so I sugest a series of age that goes like this - 500, 1000, 2000, etc. What I am trying to say is that the elder toad might even have met Rikudo himself, and when he call someone a boy, it can be anyone.
Though the ages I listed are speculative, they are likely to be correct, and therefore, I think either Madara, Obito, and Sasuke can be the person with power in his eyes.
Fact is that after Naruto met with Octopus, the first persons he fought with power in their eyes were Nagato and Itachi, but we can safely discount them because of what we know about their fight. Then, Naruto met Madara but nothing serious happened. With Obito, he had a mild fight, then the battle became Madara +Obito vs Naruto and co. My guess is that, the person with power in his eyes that Naruto will fight before the end of the war will be Madara. My reason is still the same -
that is Obito is no match for a serious Naruto with Killing intent. Besides, unless Obito becomes 10T jinchuriki, the alliance will take him down with an attack that last more than 5 minute, and probably quickly with Kakashi's help.
Finally, I think everyone should consider the possibility of Orochimaru becoming the final guy with power in his eyes. This is due to the fact that when speaking of a wild card, I think Orochimaru is the true wild card here. The greatest disappointment in this manga for the Sasuke fans will not be that Naruto becomes more powerful than Sasuke.
Rather, it will be that Sasuke lost all his will to live after knowing the truth, and get his body taken over by Orochimaru. This in my opinion is the most likely to happen as I doubt that Kishi will change the fact that the Senju are the loving clan and make them guilty of the Uchiha massacre.