All tracks with a ~subtitle~ use the same composition, so can't have different composers (affects Search a seal). All anime/CG movies in Tales games have different sound direction than in-game music and are most certainly by Sakuraba (Revival is definitively his, so is A prologue). Fatalize is closer to Tamura's style and (inofficially) credited as such at several Japanese places, he may have done some more battle themes. Instrumentation helps as well, Fun with Idol! is typical upbeat Tamura, Thank for all is Sakuraba's love for the Rhodes sound. Serenade of elves is definitely Sakuraba's as it's very close to Ivan's theme in Golden Sun. A snow light is an arrangement of ToP's Freeze.
Listening to the arrangements for the follow up game Dawn of a new Word (presuming the composers only arranged their own compositions) may help further (there many character themes sound like being by Tamura).
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