Noone can say they dont use MQ2 simply because they don't know how to install it. There are enough sites out there that even provide a ready to use version, so you don't have to compile it. I downloaded one simply to see how well the /stick command really works. (it's a godsend btw)
OK. I can give you the point of saying it may not refresh fast enough. Maybe the person that used it did install if from an exe and doesnt know all the commands to change conditions. I will even give the point of logging into the zone at the first boss mob.
Just explain one thing: When the second one was killed: how were the mobs still up between the two locations?