Bureaucrats can appoint admins and other bureaucrats and give user rights. Hollow Ichigo was inactive for years and I first edited in 2013 but checked in every so often, but when the wiki was basically attacked by vandals I helped clean it up and eventually went for adopted when Sylvanelite was inactive for months.
Yeah, almost all admins except Sylvanelite were inactive for years. Inactive admins are always removed upon adoption, if they have been inactive for at least one year. FANDOM introduced this rule in 2016, because they likely wanted that admins who have been inactive for a long time make way for more active ones. While I joined this wiki last year, I already have been interested in Zoids back in 2006 when I was 12. My interest reached new heights with the launch of Zoids Wild. I also happen to run other wikis about anime by Takara Tomy, such as Transformers, Beast Saga, Kamiwaza Wanda, Tomica and Shinkalion, so I'm quite experienced with wikis about such franchises.