I was thinking of applying this strategy with half and half, meaning leave 1 shaman on each platform and then rotate 2 on the bottom. The main problem that exists but I assume will go away in time is that your raid needs a lot of DPS to kill Thaddius at least in Heroic, and the main way to gain that is through postivie and negative charges. The more people bunched up together the more damage everyone is producing. I'm not sure if leaving them up there would allow for enough DPS before he enrages.