I don't know why you're pestering me about not responding promptly to a topic you posted on Christmas Eve. I'm still catching up with all the edits since then.
Wikizilla covering Pacific Rim is arguably less feasible now than it's ever been, given the avalanche of Godzilla/Gamera/Kong media released this year and on the way next year. While obviously not a Godzilla-sized franchise, we're still talking about a wiki with over 1,000 pages. For now, it would be much simpler to just periodically check the wiki's Recent Changes for any fanon/other vandalism and revert it. I see that someone has started doing just that since you posted this topic.
I'm less opposed than Les to a merger down the road, but we would have to amend the scope rules for it. The obvious move is to create a ruleset for Legendary Pictures films, as we've done for Toho and Kadokawa. But besides Pacific Rim and the Monsterverse, Legendary's giant monster movies (e.g. Dune, Clash of the Titans, Jack the Giant Slayer) aren't in the kaiju tradition. I don't think we have much business covering them. They also haven't produced much in the way of original giant monster stories besides Pacific Rim, so the case for putting them on the same level as Toho and Daiei is weak.
We would also need buy-in from the current Pacific Rim Wiki staff to copy their pages over. Like Les, I wasn't around for the early days of Wikizilla, but considering how plagued with plagiarism it used to be, I don't know how above-board the "absorption" of the Gamera and Kong wikis was. Probably not a great precedent.
Whatever we decide to do about the problem of a seldom-moderated affiliate wiki, I agree with Les that it should start with the staff here getting in touch with the staff there.