(Sorry for infesting the thread with all this useless Sakuraba related trivia and congratulations for a voting thread well managed.)
In terms of "colors" Beyond the Labyrinth build upon a kind of New Age style that he used for specific tracks before (e.g. first as a track in Cosmic Fantasy 4, ToP's
Stream of Time, the intro FMV of Eternia etc., mostly music that didn't make it on any official releases) combined with the more repetitive baroque rhythmic melodic composing style that Sakuraba mostly stopped using in favour of more realistic instrument usage during the switch from sequenced to streamed music. So for me Beyond the Labyrinth turned out to move a neglected style to the forefront that also finally offered a way to Sakuraba to combine the new realistic aesthetics with those of his classic sequenced compositions. I'd also like to state that Sakuraba does very well at significantly vary the "color" between different games and series (and the fact that Wolfteam developed games in many different genres resulted in plenty "colors" back then), but I can understand plenty people are not exactly eager to hunt down his more obscure works not easily listenable on soundtrack releases to hear even more of him.
Unlike other freelance game composers (notably Mitsuda) Sakuraba doesn't care about keeping the right to his works (so Bandai Namco keeping reusing specific themes is not something Sakuraba or Tamura can influence, though it does appear they get to redo it themselves at times as a way to get paid again for the reuse). He however stated to like being involved in sequels and be able to redo his music in his own styles outside of the limitations of games, an opportunity first Camelot and then tri-Ace gave him. The whole Tales issue is a very tricky story by the way, the lack of crediting is affecting his wife (a big fan of his work) of all people, what I heard from my source (who for asking got himself and me a bad standing with her as well) is that Tamura has no good standing with them and she was pushing for Sakuraba doing Tales alone for a long time (believing this already happened far sooner, Tamura going by the name Aoyama was possibly a ploy related to this). Sakuraba doing the diverse Tales arrange CDs (Bandai Namco only willing to pay them as part of prerelease or premium bonuses, the CD releases being licensed and paid by Team Entertainment) was a way to reclaim some of his pieces to his name.