I find the info about the date of October 19 very interesting. Trump’s few trustworthy allies may have other markers in some documents and conversations that also identify leakers. George W. Bush could not have protected himself like this, even if he was so inclined. Trump may be a LOT smarter than the Deep State understands.
He is no dummy. He may be obnoxious to some. He may be impulsive, he may be inappropriate. (I see two of those as virtues, and impulsiveness...people often mistake decisiveness as impulsiveness)
But he isn’t stupid.