Robert M. Gary wrote:

In any case, I don't think this was very odd. I've been in lots of
towers where only one person was on duty. Now the FAA said that the two
controller rule only applies when the controllers are ALSO working
approach. I know that in MRY its very common for delivery, ground,
tower, and approach to be worked by one controller. I can't swear that
there isn't another person in the tower but I've never heard two voices
at night.

I've run into situations where I could swear that there are zero
controllers in the tower :-)