But this is a load of rubbish. GaiaMemories are not inherently evil. The difference between the Shroud versions and the Museum versions is merely in execution, and it is shown very plainly that people are being chosen BECAUSE they are unstable, in order to evolve the memories and utilize their negative emotions.
The Gaia Memories made by the museum are inherently evil. They invariably corrupt the users if they use them directly.
The only way to avoid that is using Drivers that filter them - or deliberately expel the extra power (like the Yesterday Dopant did). If the user is unstable in the first place, the corruption and maybe evolution of the Gaia Memories happens faster, but it'll still happen as long as they aren't using a Driver or using an ability to replace what a driver would do, and those things came later exactly to solve those issues.
The "purified" ones made by Shroud were used in the A to Z movie to 'corrupt' normal humans as well, so even drawing a comparison between the two isn't proper.
The T2 memories are similar design-wise to Shroud's purified memories, but they aren't the same, and there are still some visible design differences.
Anyway, rewatch the Cockroach Dopant episodes. Shroud's memories can't be used without a driver. Cockroach says that he attempted to use the memory he had stolen with the standard tattoo port, and they didn't work.
If humans can't handle the power and go mad...well that's a problem more with humans than the power, isn't it?
What about Core? It was basically a Gaia Memory itself speaking, and it was pure evil in spite of using the Kamen Riders' memories.
Cosmic energy also ends up kind of similar. The only life forms originated from Cosmic energy that we've seen, the new Kyodain, ended up evil too as soon as they received Cosmic Energy and gained "life". "The great will of space has chosen us mechanical life-forms".
As for this, you're right. But it doesn't make any difference with regards to Amadam's mistaken statement about it. The two powers are of similar source, but diametrically opposed. Think angels and devils. Agito = White guardian, Unknown = Black guardian. I.E. Agito is NOT a failed Unknown.
They're the powers of two twin overlords, and the power of Agito is still shown to have negative consequences to most people who obtained it. Many people hurt others and killed themselves, and even Shouichi initially couldn't remember what he did and behaved nothing like himself while transformed, like attacking G3.
It's close enough if they're trying to draw a consistent theme throughout the franchise. An attempt to keep a consistent theme was also likely the reason Decade added that concept to Hibiki in the first place, since it was the only one with absolutely no connection to that idea.
said that the memories used by the Riders in the show are no different to the other memories, and if you used them in one of those USB port tattoo things it would turn you into a monster.
The "purified" memories can still theoretically corrupt the user if they were used directly without a driver. W's specs mention part of his suit/body that are there to eliminate the excess power that would corrupt a standard Dopant. However, they can't actually be used like that. The purified memories just won't work without a Driver.