I feel bad the realization that Daniel knew that Yu knew that Daniel was not Jarren was just a wash. But of course if/when Yu returned and found Jarren already there with no memory of the summit, he'd figure out he was tricked somehow. It also solves why the First Prime is always there.

My cheat for this backstory is I used my canon of "Full Circle" (otherwise known as "Interference") as the backstory for here. It's pretty heavily hinted canon that Daniel stacked the deck and told the system lords, headed by Yu to be there. But Daniel wouldn't remember that. Yu and possibly his first prime would.