ASSUMED SOUNDS is
Shota Horie
Naoki "naotyu-" Chiba
Ryota Kikuchi (菊池亮太)
Yuki Sato (斎藤ゆうき)
Susumu Akizuki
Edit: By the way, this info can be found by doing a JASRAC search for ストライク・ザ・ブラッドＢＧＭ.
Edit2: Composer breakdown now available. Majority of the music including the main theme is by newcomer Shota Horie. Also fixed those tracklist errors.