To be honest, I'd rather ditch playable Roxas, Aqua, Riku (and whoever else) for something else instead. Imo they're a waste, the only place where they would be relevant to play is on the Keyblade Graveyard, even if you fought every boss with every other six Guardians of Light + Roxas & Xion, the total playtime would amount to at most an hour. This of course is assuming they would not add extra playable scenarios to the Keyblade Graveyard where the other eight characters would be present but, even with that in mind, they simply are not as present for majority of your playtime (unlike Donald and Goofy) and hence investing resources on them to be playable is not justified (something that playable Donald and Goofy are x10 more justified to me).
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