when you have a person saying 'we are doing this because that is what the Bible says so' that PERSON is claiming to be 'the final authority' because he is the one making the decision
The above quote by Doom is the logical answer.
Realistically there is no "final" authority, as if the Church was a democracy that debates interpretations on Scripture in little local lower courts, and when these lower courts can't decide, then appeal to the final higher courts-the "final authority" in the Church. That doesn't make sense.
There is only the defectibility that is guaranteed to the Catholic Church alone, which is not a final authority-but is The only Authority to accurately judge and needs no persons to interpret the Bible for Her; nor does She teach that we should try to decide on our own, and then, if at the local level, can't come to any agreement on interpretation, go to the "final" authorities.
Anyway, this notion of final authority needs to be interpreted in a Catholic sense-and it can be
...BUT, when your talking to a protestant, they will most likely view this final authority notion in a purely democratic way which is not at all Catholic.
If the protestant revolutionists can't see this, we should not be surprised- we can only pray for them.