The conclusions can be reasonable, but the reasoning that you presented is very questionable, so I recommend that you please change the reasoning of the proposed revision based on my upcoming descriptions.
It would make very little sense for a basic attack that Count Bleck was able to do on a whim to have the same or more potency as the entire grand pool of energy that it came from, which was hyped up for the entire game to be something outstandingly menacing that would grow and eventually cause the destruction of everything,
including the heroes, unless they went on a long adventure to other universes. Despite the small Voids and the main Void being the same element, they aren't portrayed in the same way at all, including how destructive they are. The small Voids were a fraction of the Chaos Heart's true extent that had the form of the main interdimensional Void that was written to be the multiversal conflict of the story that would ultimately be stopped by the main characters. A story written as adeptly as
Super Paper Mario wouldn't have a villain's capabilities be written in the counterintuitive way that you proposed without there being a good reason.
Anyway, I think that the conclusions themselves can be reached properly in a different way, as listed and explained below.
- Immeasurable Lifting Strength for Pure Hearts users and Chaos Heart users:It's implied by the justification that's already in place for the "Attack Potency" stat. The justification would need to be phrased differently for each character, but it's fundamentally all the same. The characters gained the physical strength sufficient to destroy all realities like the (main) Void would have, and the main Void would've done so by pulling in dimensions and space-time continuums. That pulling was the main reason for why it was a threat. If that pulling proved that the Void had immeasurable lifting strength, then it should apply to characters who have its strength.
- Keep in mind that the protection that Super Dimentio gained from the Chaos Heart that prevented him from being stunned by attacks wasn't just a shield, it was him becoming invincible, so the Pure Heart nullifying that and being able to let Super Dimentio become prone to being stunned by attacks, as well as the Chaos Heart having equal potency as the Pure Hearts, both of which are already regarded by the VS Battles Wiki as being able to grant the user infinite 4D power, can suggest that the lifting strength is relevant. Denting what ties a character together is attack potency, but knocking back a character who tries to prevent that is lifting strength.
- Infinite Speed for Pure Hearts users and Chaos Heart users: It can be implied by my proposed justification for the "Lifting Strength" stat or even just as a result of generally obtaining the Void's power to destroy all realities. Simply put, a character can't pull things nor "destroy all realities" across an infinite distance without some sort of infinite movement capability. I think that this capability shouldn't be regarded as the default speed, given how slow the Void was at consuming all realities, but it's definitely either "up to Infinite speed" or some sort of other ability that allows for infinite distance nullification.
The force of the Pure Hearts are a positive version of the negative force of the Chaos Heart. The two are meant to be opposites. The Pure Hearts are designed to counteract the Chaos Heart according to the Light Prognosticus, and it turned out to be true as seen by how the Pure Hearts can defeat protection created by the Chaos Heart that are meant to make the defended invincible. Thus, a user of the Pure Hearts should have the potential to achieve the opposite of the Chaos Heart on the same scale, even if the Pure Hearts didn't physically show in an extremely clear way that they're comparable to the Chaos Heart. If the Chaos Heart allows destruction across an infinite distance, then the Pure Hearts should allow purification across an infinite distance.
With my previous clarifications about the reasoning, I accept the conclusions here without the need to clarify further.