I was referring to Mahadevan's Interview where he says that the cult object can only be the vedic soma filter but then proceeds to deny the vedic identity of the harrapans. But I agree it is probably unfair to label him as a sepoy.
see section 3. The Cult Object:
http://www.harappa.com/script/mahadevantext.html#3
see section 3. The Cult Object:
http://www.harappa.com/script/mahadevantext.html#3