Sekito put aside, I think the other composers are just credited because the game will use their original compositions for previous Mana titles. This is probably going to be arranged by in-house Square Enix composers. Apart from Sekito, Yasuhiro Yamanaka has been tweeting about this, so I guess he is involved.
Chaos Rings was eventually released on PlayStation Mobile and so became playable on Vita, so who knows, maybe they will do that more and more in the future.
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