I think there are a few too many variables here. Internal cooldowns, external cooldowns, avoidance randomness, length of fight, cleansed debuffs on the tank, debuff uptime on boss, absorb shields, gear levels, etc. You maybe could do this sort of analysis through WoL, but you'd have to keep so many controls on the data that you'd be hard pressed to find a statistically significant number of participants who fit the control criteria in order to make any real determinations. Much simpler to build the experiment yourself with all the controls in place (like in a spreadsheet or Rawr) than to try to find the circumstances you're looking for in WoL.
Kathy, I said, "I'm lost" though I knew she was sleeping
I'm empty and aching and I don't know why
Counting the cars on the New Jersey Turnpike
They've all gone to look for America