So, I'm gonna try to demystify what sorts of powers admins (mods) of multiple author kinja blogs have. Basically, under current kinja, an admin can:

    Change blog info and assets:

    Add and remove authors:

    Edit any post made to the blog:

    Dismiss any comment made on the blog:

    Block commentators:

And well that's it, at least under current kinja.

Note: Thanks huh989 for letting me use hackerspace as the example.

ETA: huh989 says that the additional owner powers are:

  1. Edit admin status
  2. Transfer ownership to someone else.

ETA2: All of the above seems to have stayed the same in new kinja.