I hope they keep us aligned honestly, it's befuddling that the international format both gets cards later and removes cards earlier than in Japanese Standard.
Surprised to see no DDE whatsoever in Rayquaza lists but I guess max elixir and the ability are enough. Rayquaza actually has some pretty serious legs post rotation with the lightning cat thing that starts with Z. One of the biggest issues I had with the list is wondering how you recover back to OHKO level damage after losing a Ray and this thing seems to be the answer. Buzzwole taking a major hit at rotation will give it some breathing room as well.
Also those reprints didn't matter for legality, legality is not based on set in Japan but on era. All XY era cards remain legal to this day regardless of whether or not they were reprinted. They were reprinted because when your format encompasses around 4-5 years worth of sets, the earlier set cards start getting spendy towards the end having been out of print for awhile. That was why Best of XY happened, to keep cost of older cards under control, not to extend legality as is the case with western reprints.