As mentioned having 2 brigs in a raid is great for keeping dispatch up for a longer duration. The difference this makes is fairly significant. As far as the debuffs stacking I'm not sure. I have seen dual devitalize icons up on a mob at the same time, however I doubt that the debuf was addative. The testing approach is interesting, but good luck finding 22 other folks who are interested enough to raid with 2 brigands who won't use dispatch in the interest of science
