Quote Originally Posted by Atmaweapon510 View Post
On a final note, I really want to know why we ended up branching into alternate timelines rather than having the closed loops that Alexander and Elpis created. This will forever remain a plot hole until it gets resolved.
After spending some time to think about it, I don't think there's a plot hole because that involved one-way time travel. G'raha's journey also changed the timeline so much that he would be completely unable to return to that branch even if he wanted to.

Though then again, how did Biff manage to get the Delorean back to normal 2015 after giving his young self Gray's Sports Almanac yet Doc and Marty go to an alternate 1985...