HeadCanon: Why the Star Locket was Important in more ways than claimed
Kinda-sorta reposting this from discord. I'm of the opinion that the Star Locket/Watch Ren gave Dymi in the SilMil was more important in canon than previously thought because of the status of the Shitennou.
The Shitennou.
The men who were Dymi's Guardians and watched him grow up for most of his life, if not from birth, just as the Inners were Ren's. Or at least, that's the HC. Why the hell would they betray their Liege, or even want to fight against, the man whom they've supposed to have loyally dedicated their lives to for Beryl's doctrine of killing those of the Silver Alliance? How could they have succumbed to Beryl's/Metallia's brainwashing or mental gaslighting/coercion if they loved him (Or their Senshi Lovers) in truth? Because I absolutely refuse to believe they didn't, that it might've all been an act. To have such positions, especially with the GC and Elysian's Head Priest in play, couldn't have worked if they were against their own Liege-to-be from the start, or that their positions were given or "earned" due to political or other such reasons; leaving them with the mentality of 'for their lands' greater good over the others' when it would've been best to have those who wanted everyone to live prosperous lives. They could've been corrupted later though, as evidenced.
In regards to Sen/Shi, because there are some people who don't like such 'forced' pairings for some reason, even though that's how they were originally paired by Naoko before the idiots who were in charge of the anime changed it (most likely without her permission or asking for insider knowledge! It might've been a whole new ballpark otherwise.) one could say that Beryl's plans included the Senshi being caught off guard or other such spy/espionage/psychological warfare tactics. That, depending on how fast Beryl/Metallia worked once Ren came into the pic, unless she'd already been working on them before Ren appeared and started 'ruining her plans', it wouldn't be too strange if that was one of the reasons Sen/Shi came about in the first place. But then, there's the Senshi themselves. I highly doubt that any of them (One's power being Love of all things, another suppressing her emotions as much as possible in favor of logical thinking, the third being able to sense Evil and Dark Intentions and the last being protective and stubborn for it; though one could say she'd be the 'easiest' as a result) could've been fooled by smoke and mirrors and lies. So, no, I'm of the firm opinion that they were fully corrupted/brainwashed after they'd fallen for their Lady Loves. And that's if those who fought against them weren't clones or coincidental look-a-likes as a certain HC going around says might've actually happened.
I rec Jecir over on FFN to get a taste of how such a HC goes; there's four in the series with a technical fifth that's an AU role reversal.
All that aside, I believe the reason why Dymi/Mamo was spared; at least until a certain point is 'obvious'. And, no, it's not due to the Kinzuishou because he'd have never been able to be brainwashed later if that was the case. Even despite its dormancy.
It's the Locket/Watch.
It’s a good theory, but I don’t know why. I’m more inclined to think that the reason only Dymi was saved thanks to the lunar medallion was because he was the only possessor of a purifying magical object.
If we look at it, Sailor Moon is the only one with purification powers, capable of breaking mind control. The powers of each Sailor Senshi are the specialty of their home planets. So: The people of the Moon are experts in the arts of physical and spiritual purification, Mars in the protection and exorcism of evil spirits, Mercury in data analysis and collection, but also in healing, Jupiter in thunder and vegetation, and Venus in all kinds of metalworking.
Perhaps the entire quintet gave their boyfriends mystical objects from their homes, but rather than the Shitennou not using them out of social expectations, it was because they had different functions that didn’t include protection against brainwashing, unlike his master.