Re: Time travel method and ripple effect thread
Bryan Singer mentioned "fixing" in his interviews, but he did not say, all these fixings will be done by altering time periods. They fixed Beast's look in DOFP and they didn't have to alter the past to do that.
Cyclops could just appear at the end of the movie w/o an explanation why he came back and just let that be a teaser to whats in store for the next movie. Cyclops' return doesn't have to be a product of the time-travel mission.
And another thing, if they are gonna resurrect Cyclops because they changed in this past, it would be odd if they are gonna left out Jean Grey.