Okay, now the Zeo crystal planet plot point bugs me because damn near everyone in the group knows what they are EXCEPT Ari just so we can avoid exposition because who's reading this book except MMPR fans. Right? So obviously you already know what the Zeo crystal was and that Tanya's morpher is powered by it, which is the only expisition we get aside from everyone going "ZEO CRYSTAL PLANET?! OH NO!" Hekyll, I can maybe understand because he spent a good chunk of 65 million (yeah the book doesn't say that, but if you watched Dino Charge then you know that's the time frame) years doing nothing but studying universal space magic because Keepers and Zenowing are space wizards, but even then he just says he gets the feeling it makes the Dark Energem look like a trinket, referring to the situation and not necessarily the planet.
Like how do Mike and Cam know? Andros has spending a good chunk of his life searching for Karone and has had some connections with Zordon as his special space agent on the side, so him learning about the Zeo crystals is a possibility, but again how do Mike and Cam know? That bugs the fuck out of me