The settled precedent is that federal officers can be impeached and tried after they have left office. That Roberts' absence supports your position is just wishful thinking.
And your tell is showing.
The Roberts thing is only one prong. I pointed out several others. Kicker said next you'd be having me write your responses because you get so lost. You know what....I'm going to do it because I have a bit of sadistic streak.
Here's what you should have said: "I didn't mean to use 'settled precedent' in its legal sense. Perhaps I did overspeak. But there is precedent, and it's very good precedent, even though it's old and not directly on point. It establishes federal officers can be impeached and tried after they have left office, even if it doesn't address the issue of the president himself."
But you didn't. Because you are stubborn and will hold onto any foolish point even when it's evident you've gone off the rails and are lost.
And as we've discussed before, that tell actually says more about where you are, than where I am.