KH Missing Link takes place about 4 generations after Ephemer's time.
So, I was originally right about Brain having time travelled only a short interval, but then changed my opinion. I did that because the grandfather thing seemed to have more weight than the secret report wording where Luxu says that he gave his keyblade away during the events at the end of UX (and not after them). The question is, can both be true? Four generations is about 100 years, then another 50 or so to Eraqus and young Xehanort, and 85 from there to the end of KH3. That's not long enough, but could there be a break somewhere else? We do know that Eraqus did time travel, because otherwise he would be over 90 years old in BBS. So, maybe Xehanort did too, and there is a long gap just before the scene where he meets the MoM?
Argh!!! Nomura, why can't you just do things in an order that makes sense?
His descendents have each formed their own societies: the main family who carries his bloodline is the "Society of Successors", while the branch family is the "Society of Non-Successors".
I wonder how literally we should take the term
bloodline here? I have really hard time believing that Ephemer would have children with anyone else but Skuld, and while she has the option to return to early Scala via time travel, the meaning of her name suggests that her place is in the future. Also, having a literal bloodline of keyblade wielders is by itself problematic, because the keyblade chooses its master, and it's unlikely that there would be worthy wielders in four generations of same family in a row.
Maybe it just means the group of people to whom Ephemer gave the important items (the Box, the Book, and Master's Defender), and the
"bloodline" is a bad translation caused by misunderstanding?