I beleive there is a hole in the Dashboard for champion challenger emails. The graph for Opens in the dashboard shows the percentage of opens of each email subject line, but does not show what this percentage is of. What I mean is there is not a total sent.
I found this was higher since the Champion Subject line was sent far more times, so the percentage was actually accurate. But how are clients supposed to know? Pulling smart lists for each email sent. For this test four separate smart lists are required. I vote we place the "OUT OF" number on the totals.
Example the Opens could read 351 out of "some number". Then the percentages will make sense and not require more investigative work.