I think this is Google shooting itself in the foot.
TechAltar on YouTube provides a very good explanation of why Samsung (and probably other phone manufacturers) are cautious of Android[1]. This is especially true when Google acts as a hardware phone manufacturer.
The summary of the argument (from memory) is that Google provides Android to hardware phone manufacturers, and it doesn't compete with them in the hardware space. Google owning Moto (and now HTC?), makes Google a direct competitor with hardware phone manufacturers -- which you could argue are its main customers in the phone market. Google can give Moto (HTC?) unfair advantages because it owns/controls Android; even if it's not done maliciously (e.g. having access to Android source before it becomes public).