I agree with this theory because Peridot in Warp Tour crushed on of the robonoids, whereas Peridot in Marble Madness states, "Why do you keep destroying my things?" Even though, the Crystal Gems did destroy some robonoids, Peridot in WT also destroyed one, if what she did with that disabling time bomb just turned the rest of them off (although I'm assuming otherwise), and it would be odd if that was the same Peridot who got defensive about her destroyed robonoids.
Anyone catch that Rick and Morty season finale?
Seth, you have no idea how proud of you I am of all the Rick and Morty references you put up here.
As if a whole town under communism wasn't good enough, we get the whole country of colorful ponies unified.
watch it offer smut innuendos every now and then
So that's why the CMC are hidden