The VA is not supposed to "develop to deny", and Veterans attorney Chris Attig suggests including this language in your appeal:
.a VA Nurse offers an opinion on the cause of a complex motor neuron disease she's never heard of...
...an Internist with generalized experience writes an opinion on the causation of a cancer
...VA Docs support naked conclusions with NO medical evidence
...VA docs use exams to Develop the Claim to Deny it (an illegal practice).
This is more than a on