Before I answer this question, let's consider what The Moody Blues think of the first three years of the band by checking their line-ups (
http://en.wikipedia.org/wiki/List_of...s_band_members) and discography:
1. The Magnificent Moodies (pre-psychedelic era line-up)
2. Days Of Future Passed (start of psychedelic era line-up)
3. In Search Of The Lost Chord
4. On The Threshold Of A Dream
5. To Our Children's Children's Children
6. A Question Of Balance
7. Every Good Boy Deserves Favour
8. Seventh Sojourn
(Brief band split, 1974-77.)
9. Octave (end of psychedelic era line-up)
Also, check their history on their site -
http://www.moodyblues.co.uk/index_main.html. You'll find no mention of anything done before Days Of Future Passed.
So, back to the question - should Bob Brunning be considered a band member? Well, unless The Moody Blues suddenly care to mention their founding band members and first album in their history on their official site, I'm voting no.