"Logos" meant a few different things in ancient Greek (or later philosophy), but never the unconscious: divine/cosmic end reason of things, philosophical discourse, rationality, and so on.
No, they didn't. Here's how Heraclitus used Logos (as I described it above): https://chs.harvard.edu/chapter/17-the-heraclitean-logos/
And here's how Aurelius used it: "Marcus Aurelius uses logos to refer both to the divine that infuses and directs all things in nature and to the “fragment” of God, the rational mind, that is found in every person".
Nothing to do with the subconscious in either case.
I don't care to argue. I believe everyone is right in their own interpretations. It isn't unheard of for something that predated an idea to then be interpreted as an extension of said contemporary idea.
“Everything can mean anything. Words have no meaning.”
> I don't care to argue.
No wonder. Who would?