Tobirama beat izuna in swords aka kenjutsu. Nothing more nothing less.
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tobirama was not equal to madara at MS or Izuna
Tobirama one paneled him. Surely your obsession for the Uchiha doesn't stem as far as bloody Izuna? Who's merely a plot device to give Madara EMS? Tobirama beat him, just like Hashirama beat Madara.
I don't like the fact that Tobirama could be=MS Madara, but it's plausible we need mor info on Izuna.
What's wrong with Tobirama being = to MS Madara? Tobirama is a Senju, the 2nd Hokage, and Hashirama's brother. Seems like a legit matchup to me. Besides, we all know the powerscale tipped in Madara's favor after Tobirama did Izuna in. MS Madara=Tobirama and EMS Madara<=Hashirama.
Current Madara Swallows both of them up together and sh*ts them into the ocean. So in the end Madara ends up the strongest.