e.g.: Elsa and Anna are as close as they have ever been.
Does it mean that they are as close as they used to be, or, they are closer than ever?
What about:
Elsa and Anna are as closest as they have ever been.
and
Elsa and Anna are as close as they have never been.
I'm getting more and more confused as I'm typing out these sentences. I think at least one of these is wrong usage.