Morgan, you said, "I think that heresy refers to that part of what is generally thought to be “orthodoxy” that is in the process of being revealed as inadequate." 

I don't know if history agrees with you.  Jesus was a heretic and was crucified for it.  He was on the losing side but ended up winning. I think a heretic is often (although not always) exactly what the prophets are in their time, only vindicated later on.