You got the facts wrong. Powell stated more than once she would want the Brady materials first, then she would withdraw.
I saw Powell herself state she had no intention of moving to withdraw the plea. I have no idea what you saw.
And her legal argument was not an actual legal argument anyway, so the plea was never going to be addressed. Her “argument” was grandstanding, and apparently included an unethical cut and paste plagiarism.
Her Brady argument never analyzed the circumstances beyond the grandstanding, as Sullivan demonstrated in minute detail.
But the real outrage is that she turned Flynn into an unrepentant liar, who now will be sentenced as such.
People (like me) who support Flynn ought to be outraged at Powell, but instead they are lauding her for screwing him royally.