When aDPS is looked at from the standpoint of 'percentiles', there is no consideration given to what group compositions were used to attain said percentiles. The result is completely meaningless. The number has no value whatsoever unless you're making a comparison of two runs with the same group.

Unless you're looking at percentile data in the context of the damage generated under individual raid buffs organized by percentile data (Mug, Arcane Circle, and so on), you cannot comment on a job doing 'X' more damage due to contributed DPS.