I THINK the OP has the initial post solved somehow, and I also am not sure what that issue really was.
My take on that post is that the OP was trying to use a variety of apps, yet struggled with the Finder "randomly" coming to the front.
I also think that using the app switcher helped OP, or at least that was what I think post #14 said.
Then, the OP sort of sits back and waits for the "Great Finder Discussion" to settle down.