Parser is not really an accurate measurement to begin with. It is just showing a figure for your overall DPS at, and for most of time, it is not accurate.

Takes BRD for example, you may be parsed at 250 DPS in T5, but if you didnt do your CD correctly, you still can not break out people in conflag. This is a scenario I have seen in last night's T5 progression party. His overall DPS is up to par, but he did grief mistake when handling conflag, because he would always dot conflag with venom and frostbite before his other CDs.

Did parser reflects everything in this scenario? I seriously doubt that. Parser is only abe to give you a general idea of where you are at, but it can not reflect all the details.