i'd say go on without friedenbach. if he really opposes the consensus and is not willing to compromise just ignore and move on!
Consensus = An opinion or position reached by a group as a whole
yes, and with this definition of consensus you won't be able to do ANY progress at all. you would also need 100% miners agreement for example to call it a true consensus. that means that only ONE miner could potentially block any change you make to the protocol. because, hey its not consensus if not everybody agrees right?
true consensus is utopian.