Actually there are several canon things that directly contradict his speculation~
The only aspects that tend to be a cog is Void with it's whole inevitability horrorterror bit and Doom for obvious reasons.
Still don't see how Void is based on inevitability, seeing as it on many occasions have been used to "duck fate".
Seriously, it allows you to evade the Lord of Time's wrath, how is that "inevitability"?
Void is the final state. It is what everything ends with. When all stars die and all planets crumble, there is naught but empty Void.
Time has a link to void, but as it is not Primary Void, it can't catch that which does not exist.
Most Void powers involve making things not exist or removing the trait of nonexistance from it.
What Roxy did with Rose is an excellent example, she made them not exist physically to dodge the psionic blast.
Aren't some classes based on subverting/inverting their aspects, anyways?
Yes; Prince is one of them. Bard is the other one.
AFAIK these two are the only aspect-destroying classes.
Prince is based on destroying their aspect with their aspect. Eriden used Hopewands to destroy Hope of revival of the troll race, as well as several other hope based things.
Bard is by nature a randomized class, it inverts between inverse and normal almost at random, as was shown with Gamzee sober and Gamzee stoned. As he was Rage, he inverted to Hope, inverts being always unhealthy reduced him to a stoner believing in "miracles" and that messiah crap. When he went sober, he went to the extreme. Bars being a random class also is why he dealt more damage then Vriska, in all honesty, Gamzee's Randomkind is yet another example. Letting him use certain weapons at random times.
Aren't some classes based on subverting/inverting their aspects, anyways?
Subverting like Prince does is different then Inverting, like when Rose went Grimdark and Jade went Grimbark.
I don't see how Space == Change.
Same here. Breath fits Change better. I think of Space as equaling Potential instead.
John gained freedom from the plot as a breath, time and space and on occasion, life do change. Potential is a class based thing, not aspect, Jake's Pageness crushing Jade's Grimbark is an example.
Well, Rogues of Void (and presumably Thieves) can remove Void from an object, but that's not quite the same.
Rogue is a support class, used to benefit the team, as Roxy did with Rose. Thief is a active class, Vriska as a Thief of Light stole the fortune and luck from her foes, Light deals with knowledge and fortune, Void deals with inevitability and lies.