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They were all familiar with each other and of course bound to be influenced and inspired by Bach. Kellner is very uneven in the quality of his writing. I like to think that when he was part of the Bach-circle the feedback and inspiration raised his level of writing. After that, his work declined.
But this is just an unverified idea.
I'd have to research the time of wrinting of the different compositions I know of Kellner...

Your gut feeling may be right...

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