Tobirama is faster than Madara even in this panel, but that didn't stop him from dodging. So I don't see why we're talking as if those events are mutually exclusive or something. Tobirama was the fastest shinobi when they were alive but Sage Hashirama should be able to dodge him using your own logic. So either Tobirama wasn't the fastest guy around back then, or it's possible that people could react to Tobirama even though they were not as fast as him. Tobirama gets his fastest Shinobi title possibly from having the best Shunshin and Hiraishin, not from having the best striking speed or reflexes. That probably goes to Madara and Hashirama.
Again, Madara was fighting Sage Mode Hashirama and continued to fight him until the latter ran out of the mode, which means Madara could operate at those levels even with EMS, which, in turn, proves he could dodge Tobirama even without Senjutsu. I agree it helped in this panel though—because he was almost blindsided.