Are you arguing that the licensing requirements of the CDDL are the problem here? To the best of my knowledge (though I am not a lawyer and this is not legal ad

Are you arguing that the licensing requirements of the CDDL are the problem here? To the best of my knowledge (though I am not a lawyer and this is not legal advice) that is not the case. My understanding is that what Canonical is doing here is not a violation of any CDDL licensing terms, and the legal question is purely of whether or not it is a violation of GPL license terms.