The two are a lot closer in power than you think. Back in Hashirama and Madara days, it was stated that Izuna and Madara were basically even, with Madara having a slight edge. Well Tobirama eventually beat Izuna and Izuna ended up dying from his wounds. So Tobirama and Madara are probably like Guy and Kakashi. We expect Guy to be weaker than Kakashi because of the sharingan but Guy is 50-49 with Kakashi. Basically what i'm trying to say is that Tobirama could give MS Madara a lot of trouble and maybe even EMS Madara.
I'm talking about before Konohagekure was formed btw.
I'm talking about before Konohagekure was formed btw.