Hey there! In this particular situation, giving a standing admin the rights of a bureaucrat is unproblematic. However, I did want you to understand there's very little difference between a bureaucrat and an admin in terms of the abilities they have. Take a look at this bureaucrats' guide to get a sense of your new rights. Basically, the only thing that's changed is simply that you can now give other people user rights — and, in some cases, take them away.
Also, be aware that sometimes we automatically remove rights from long-inactive admin when an adoption request goes through. Only one of your two co-admin was inactive long enough for this to happen. Orexin2001 is still your co-admin, so you might wanna start up some communication with them about your plans for the future.
Thank you very much! Yes, I am aware of the role of the bureaucrat, and I considered it before I applied for the adoption. In part, it is a safety measure, but also a motivation measure for my continued involment with the wiki. Should something go sideways, I don't want to have to wait a week until my co-admin responds, and run the risk that it never happens. Being a bureaucrat takes that monkey off my back.
It was always the plan that Orexin2001 remains my co-admin. We've had an open-door policy in the past, but it seems that his priorities have shifted away from this place.
Thank you for pointing out my error about JS. I'll make good use of your suggestion.