Actually, as TSR's history proves, mechanics can't be copyrighted. Tables may be considered copyrighted, the words themselves that describe the mechanics may be copyrighted, but the mechanic itself cannot be copyrighted.
But we're not talking about copyright - we're talking about license terms. Use of the OGL negates the copyright factor.
But tangentially, yes, I agree the exception would be someone who ignores the licenses, produces a "compatible" product without the branding. They'd have to be very careful.
However, that's not really relevant to a discussion about the OGL, and certainly doesn't help the OP in his question about how to produce an OGL product!

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