>>57234028
They were probably interested in Kalos because they wanted to bring back megas and have Zygarde in the spotlight for once. Lately Game Freak has been doing what they are actually interested in like making a brand new Sinnoh game rather than a remake of DPP.

>>57234028
they don't want to explain the original dragon yet

>patternfagging with one point of data
They didn't, they had no set roadmap of prior releases that would hint towards them following the release or remake trope, which was its own separate thing (as evidenced by them starting L: A based in old Sinnoh, but accepting a remake may be needed because of demand).
Legends seems to be a look into the early days of human/pokémon relationships as we see in the modern era. When people initially developed a pokéball to catch and carry the magical elemental creatures they lived alongside to drive the revolution of their society into the modern world we see today (L: Z-A's blurb stating Lumiose is undergoing a redevelopment project with the aim of building a city where people and pokémon can live alongside one another). And as such, has no remit to follow release order or to act as a not!remake, when Game Freak already stated internally they wanted Legends to be different from the usual remake, a new direction for the series.

>>57234875
From the leaks, OG dragon was a melding of Reshiram and Zekrom, with Kyurem being conceived and designed later in the project's life cycle. Which makes sense to me, as I always envisioned Kyurem as the twisted empty husk of the OG dragon - which looked nothing like Kyurem but due to the massive amounts of energy given off by the splitting of the OG dragon into Resh and Zek, its OG looks were warped and twisted, leaving what was to become Kyurem.