Owner / admin of team not granted if owner / admins leave

I'm currently the (only) member of a team that has no owner or admin, which means I cannot delete or make edits to the team. Realistically I can just leave the team, but that would make us unable to re-use the team name at a later date.

Start by tracing the team ownership and administration behavior described in the issue, since no implementation files or tests are named. Confirm how teams behave when their owner and admins leave, then define completion as the remaining member being able to manage or delete the team without preventing future reuse of its name.

Written by the indexing model from the issue text.