<p>The neurosurgeon doesn’t fit the definition of the peer review that D is asking for (“a peer (i.e. friend) who knows you well”), but rather that of a regular LOR (“who knows me very well on a professional level”).</p>
<p>I agree with ^. You can definitely send a rec from the neurosurgeon in addition to everything else, but the roommate should definitely write your peer rec.</p>