Just as the Title says,
Lets go down through some basic Info before going down to details
Tobirama's Last Day of His Life
Lets put some info in..
Tobirama's Sensory Abilities
Tobirama was also a very gifted sensor ninja since childhood. By simply touching the ground with his index finger, he could detect the presence and number of enemy shinobi and also could determine the clans they are from
What Really Happened That day
At some point during his era, he and the Second Raikage met to form a formal alliance between Kumogakure and Konohagakure, however, Kinkaku and Ginkaku, Kumo's Gold and Silver Brothers and some other Unknown, attempted a coup d’etat against them. Before Tobirama jumps himself into action he leaves Sarutobi Hiruzen in Charge as Hokage from the Next Day.
We all know, Well most of us Know that Tobirama was completely done by kinkaku and Ginkaku. But we are wrong..
Actually the truth is I guess
1. Ginkaku got Killed..
2. Kikaku uses Kumara Tranformation and goes on a Rampage but gets stopped by tobirama..
3. Now even more shocking is when Kakauzu says *He can't even remember how long it has been since I've seen Kinkaku do that* *Some one Must have taken Ginkaku out*
So this Explains Kakuzu was also present with gold and silver brothers while they made their coup defeat.
4. Here Kakuzu also says its been a while, when he lost two of his hearts in a battle..Which I assume Kakauzu also fought a weakened Tobirama and killed him..
kin and gin died much later than what your claiming. they knew of third raikage, and called him third raikage. third raikage im guessng is about 50 years old and would have taken the position around 25-30.
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Re: [THEORY] How Tobirama was Assassinated!
Is it too hard to belive that tobirama's run in with the Golden Horn force and the Kingin bro's happened at different times? The Kingin bro's attack was confirmed to have left him near death, not dead.
Tobirama was a diversion so he would have been running away from the guys who killed him, not fighting them head on.
Since the Kingin bros attacked him earlier than the Kinkaku force, and it is unknown what happened to them afterwards, there is no evidence that Tobirama killed them. I think it's just as likely that what happened was this:
1: Kingin Bros attack 2nd Raikage and Tobirama. Tobirama left near death, 2nd raikage unknown. Kingin bros' win, and inadvertently leave tobi alive.
2: Kinkaku force, Not named after Kinkaku, Attack Tobirama and his minions, tobirama sacrifices himself so Hiruzen, Danzo, Ect can live. Kinkaku force kill tobirama while he is being a distraction.
3: At sometime later, Kakuzu fights Kingin Bro's. Presumably Ginkaku is killed. Kakuzu might loose 2 hearts to Kyuubi mode Kinkaku.