So, we learn this time around that not only could Rush never change the clock, he could never stop it, nor ever change Destiny's course in any significant way. But now apparently we can. Looks like Rush hasn't had as much ability to save the people from previous episodes as may have been believed.
But now it makes you wonder, will they use this much in the future?
Hmm, maybe should have named this something else in hindsight, oh well.