[qq]I don't think Ellone sent Laguna bakc in time[/qq]She didn't send anyone back in time, except for Squall and his friends. They weren't really "sent back in time", either - just their minds were. She can send someone's consciousness into the brain of a person in the past, so that they can 'eavesdrop' on past events.[qq]Laguna was able to change his past, so, in fact, he DID marry Raine. There is evidence for this-When ypou see Laguna give Raine the ring, he looks like he did in the flashbacks. But when you see him stanind alone in the feild, he has some grey hair!
[/qq]That's a flashback. When he stood by Raine's grave, he thought back to when they married. After all, he was away for 17 years. He'd never have known that Raine died giving birth to their son... so seeing her grave for the first time would bring back all kinds of memories. Time compression ended when Squall etc got home; no-one travelled into the past because of it, since the compression wasn't complete. A small team were able to go into the future, but that was all.