If it didn't happen...then all conversations are merely sidebars.
The guy filling in for Levin had a perfect example. Spouse calls while you’re out with friends, nags and complains, and feeling frustrated you hang up and say “That’s it, I’m done! We’re getting a divorce!”
Later, after you calm down, you say “Hey, you know I was just blowing off steam, right? I wasn’t serious about a divorce, but just do me a favor and don’t mention I sad that to (spouse), it will just upset (him/her)”.
Show me one person on the planet who hasn’t said something just like this.
The only thing that matters is what he DID.
The president nor McGahn took any overt action to fire Mueller. Trump didn't fire Mueller. McGahn resigned without doing anything. Where's the obstruction?
Words aren't obstruction. Actions are.
This going nowhere.