I cannot speak for Rigel, but as a newcover to Dom's stories I thought I would step in to express my own viewpoint. I really think, if anything, you're arguing Rigel's point for him, because you simply list reasons why they are passive without refuting the original claim that they are indeed passive.
Obviously, it would be totally inaccurate to simply label a protagonist character as completely passive. However, I think it is a fair judgment to state that Rory, Quinn, and Owen all display major passive characteristics, regardless of the reasons. Rory refuses to ask questions about anything--his surroundings, the sexuality of those he lives with, his own feelings towards his mother and father--even when prompted by those around him. The defintion of being passive is to be unresponsive to an action directed toward you--how many times has Rory been faced with a question or truth and not responded in the obvious manner? Typically, he shuts down or runs away.
I mean, the kid is the poster child for "Passive Aggressive." And his father ain't too different, himself.
Owen and Quinn exhibit many of the same qualities, though I believe to a lesser degree because as they develop as characters they become less passive and more of an active participant in their own lives. Quinn in a somewhat irrational, schizophrenic manner. The result is a dramatic tension that slips opportunisticly into melodrama at the appropriate moments. And that's not bad. There's nothing wrong with a passive character, but by nature a passive protagonist is in many ways problematic because the protagonist traditionally moves the drama forward instead of being moved forward by it.
Which is often the case with Dom's writing.
For me, and this is also open to tonal intepretations, it creates a tension on the page (or screen) between the reader and the main character because of what the character knows and what the reader knows, even though they are looking through the same pair of eyes. Which is interesting, when you think that Dom has managed to create a quasi-omniscient reading through a limited, first-person point-of-view. Which creates a subtle undercurrent of irony through the entire work because the protagonist's actions often seem unrational because what we as the audience know is so much more substantial than what the protagonist knows.
The reverse current, though, is what Rigel identifies in his original post: the feeling of stasis and/or hubris that develops around the main character as readers wait chapters for the action foreshadowed far before. Which heightens anticipation, which often spills over into downright frustration as a reader. Is that a bad thing? Not necessarily. But the constant expectation is exhausting at times. I myself will admit to skimming (and I usually go back to re-read because of my acute sense of literary guilt) because my mind already knows the mental state of each character during said scene, and I'm ready to move on to the inevitable climax (or climaxes, as the case may be).
And so there comes a moment where you want to reach through the screen into the imaginative beyond, grab young Rory by the shoulders, and yell, "Wake up, man! Do something!" Thus, you've literally been sucked into Dom's world, which is authorial genius. He just runs the risk of the reader eventually feeling like there is no one DOING anything and not reading any more.
I mean, think about the disjoint between when the reader realizes that Eddie and Jase are a couple (with the original photo) and Rory figuring it out--not on his own, I might add. Seven chapters! Seven chapters of not even asking a question. Of not even going to his father's bedroom (or the attic, which he has yet to visit). And after all that anticipatory drama, one has to wonder when we'll slip into the realm of an anti-climatic literary climate. At the end of the day, it's Dom's story, but there are problems with just about every literary angle with which a story is pursued. You just have to mitigate the minefield, is all.
In the publishing world, that's why we have editors. (And no, I'm not stating Dom needs an editor, but I will say that it probably wouldn't be a bad idea just for the inevitable typo.) That's what this forum does on the Internet--or should do--collectively back edits a body of work. The only problem (or perhaps the best thing) is that the original work still sits there, uneditted and unfinished for future readers. Pretty interesting stuff to think about, really.