I think you have it backwards: if there is no reason for consciousness to have any concordance, then it can go either way. And there is evidence of lots of evolved traits that have indeed gone "either way". Or it could be that consciousness is not a blind side effect but actually provides survival value. Or maybe it is a side effect but it's harmless. There are lots of possibilities.

In any case, it seems this is a diversion from the main argument: if you aren't aware of a process, then it's not a conscious process on your part by definition.