Maybe the band wanted the mixes that way, or maybe they didn't care and just let him get on with it.
Either way they have been working with him for almost 2 years now, so he wouldn't be able to continue to work with the group if the band and their label did not approve of his work.
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As much as it pains me to say so, I think you may be on to something regarding the part of your post I referenced in bold.