i agree to an extent, but doesn't this ring true for most bands? what would thrice be without dustin? brand new without jesse? jew be without jim?
i do however think that each band member of paramore really adds a lot to the band as a whole. i think j. farro has his own style of writing that is different. maybe not groundbreaking, but you can always tell it's him just by hearing it. they are all extremely talented musicians and have years of growth ahead of them. keep in mind that two of the members are still in their teens.
The thing is, all those guys have extremely talented backing members -- their instrumentation is probably better than anything else they do, and with Paramore, take away the vocals and you have an average-at-best pop-rock outfit that bears very little resemblance from every other pop-rock band on the block. Just my take on it -- I don't see anything particularly special about the other guys in this band, and maybe in a few years I will. Right now however, nope.