If you would only let those poor trumpets, trombones, and French horns into your core, maybe you'd understand the beauty of it all, that percussive fugue of shrill sound driving you to battle.
Don't worry: Ichinose's arranged most of Masuda's battle themes since Gen 5 and a revamp for Dexoys' should be a piece of cake. Newer instrumentation could help it a lot.
Re. RSE's soundtrack: the weirdest thing about it isn't the abundance of (great) brass, but the other wavetable sounds Ichinose and Aoki used for the first time. Their table of sound samples was limited because the game started development before or around the time the GBA was released. As a result, there'll be chords made from samples that sound both like flutes and organs, creating a weirdly organic yet artificial texture to the score that's less present even in FR/LG. There's a lot more maximalism, counterpoint, and keyboardist techniques used here than in most other gaming soundtracks, mainly so that young ones couldn't avoid the melodic ear worm blasting out of the weak handheld speakers. And because of his experiences in writing these games' soundtracks, Ichinose has adopted this level of complexity as a personal style, albeit one built on solid principles of composition.