1. I like Zodyl, but talking to him must be the most infuriating thing one can imagine. He has things he wants to tell you, but won't answer any of your questions until you agree with him or make a declaration of whatever he wants to. And then it's all "Could've told you, but you left me hanging" xD
2. Let's start with the simple things. We knew that those stronger beasts were their (Vandals') responsibility. Now, to usurp Heavens Zodyl seems to think that an even bigger, more powerful beast might be enough (unless he's lying and the current goal is something else and going to Heavens comes next). Watchman Series seems to have had a lot of wielders before, thus having a lot of power, more than regular Jinki, which is why Amo's boots are being used to launch a kaijuu.
3. Now, Guita, too scared to act before, might now be all into this, since she's a kaijuu-head - great! At least my girl is safe for now and wasn't used as an example by neither Cthoni nor Zodyl.
4. Now for the big hitter - Zodyl MADE this series? We should consider what he means, because if it's about actually manufacturing them, he'd have to be quite old, which his body doesn't show. This COULD be tackled in a few ways though. Either the boring one, like his Jinki or somebody else's lets him stay young for decades without deteriorating or maybe Zodyl =/= Zodyl. What I meant is - if the emotions and power of this series are this strong, maybe somebody's will overwrites Zodyl's will, slowly but surely?
5. If it's indeed like this, he might now be an amalgamation of real Zodyl and whoever left their energy inside his coat. And THAT person might've been the Watchman Series creator. That would also prolong the mystery of where Zodyl ends and The Creator starts, until we actually learn more about this creator. What do you think?
6. Oh, let's also entertain the possibility of Zodyl not meaning "creating the series" literally. Maybe he just created the brand/name and attached it to those items or something more metaphorical instead?