Here’s the timeline as it stands:

MAY 11 — NYT reports that two Comey “associates” leaked information about a one-on-one dinner between Trump and Comey in which Trump asked for Comey’s loyalty. The article makes no mention of a memo, but contains information about the private conversation so detailed that it would be weird if it weren’t derived from a memo written by Comey after the dinner. It makes little sense that “associates” of Comey would remember the verbiage of the conversation with such detail, and then independently leak that verbiage without any direction from Comey himself, particularly when Comey admitted that he was willing to make such leaks only a week later.

May 12 — Trump tweets that Comey had better hope there weren’t recordings of the dinner that would go against the quotes in the May 11 NYT article. That tweet makes a whole lot more sense now that Comey was leaking. Trump was saying to Comey: “I know you’re the leak, and I might have recordings of our actual conversation that will prove that you’re lying.”
Somewhere in between May 12-May 16 — Comey, according to Comey, wakes up in the middle of the night and feels the sudden need to leak a memo from February to the NYT.

May 16 — NYT prints another article alleging that Trump asked Comey to leave Flynn alone. The source of this article is specifically listed as a Comey memo recorded by Comey after an Oval Office meeting in February. The memo was not given to the NYT, but rather read to the NYT by a Comey “associate”(notice the use of the word “associate” again). We now know that Comey gave the memo to his associate with the specific instructions to leak it to the NYT.

Remember, only two people were at that dinner, Trump and Comey.

OOPS!