So, here is how this works.
In no case is the command chair EVER empty. What happens is if the officer of the watch is called away for whatever reason, the next most senior officer will fulfill that role. They would move from their duty station to the command chair, and a replacement from their department would take over that role.
The 16th is a Sunday. This is a little problematic on the roleplay front, as the posts we have done include both Zai and Owen but indicate that neither are on the bridge. The schedule shows Zai in command, Owen at the CONN.
Let's slide this to Lt. Moriden in command, PO Warren manning Ops. In the future, we will try to be a little more careful as to watches, but it's the first posting in nine months, we might overlook a schedule here and there. 