"Who else…
…is joining?"
"That is actually one of the things we will be discussing here. There—"
"Riley Ross will absolutely not be joining the Tournament."
The universe has done so many things that would be considered a mistake, and Diana has witnessed some of them; and in most of them, she was the one responsible. And even now, as she stood by one of the biggest mistakes of her life, she was going to ensure that the mistake wouldn't give birth to another.
She loves Riley Ross, truly—she would not have tolerated the things he has done for so many years if she hasn't. But right now, Riley was involved in something that no one could control.
The multiverse issue is taking a rest, but it would only be a matter of time until it all opens up again. A box, after all, that has already been opened once can't be truly closed again. There will be cracks, rips, and tiny holes where things could escape and go out.