The problem is, for most of the Hokage (ESPECIALLY Tobirama), we barely know the scope of their skills sets:
-Hiruzen was 69 and his chakra had dropped dramatically according to that sensor ANBU watching, thus limiting what technique he could viably make use of.
-Hashirama was being controlled by Oro, so he wasn't actually fighting, but Orochimaru was.
-Tobirama...the same as Hashi.
-Minato: We've barely gotten to see him fight, much less actually pressured by his opponents, which we've seen him troll thus far
-Tsunade...we never get to see any of the Sannin pull out all the stops. =/ Maybe with Jiraiya, but she and Oro, nope. U_U
Except Kishimoto said Hiruzen could. Hiruzen was called a God for goodness sake. I could also point out that Minato had "limitless potential" and was going to surpass every ninja in history according to three very powerful shinobi, two of which were Hiruzen's own students. U_U But i don't need to, because we don't know how the match ups would work when they don't invole the 3rd.