This was originally in response to my saying that we did not want or need a Pope. I'm still not certain of the connection. Does this mean that only the Pope may declare anything with confidence? Do you want us to preface every statement with "I think" or "I suppose" in order to be consistent with our claim of not being our own popes? :) That wouldn't make sense to me. Our authority is scripture, yours is that plus more. We both use our respective authorities to declare our views.
In Catholic debate, the Pope is the last instance. All disputes previously unresolved end in him. So, one can have confidence, inasmuch as he knows the mind of the Church as expressed by the Pope.
Again, -- I said it before -- this "everyone's a pope" rap is a caricature. It is only accurate on some metaphorical level. When someone tells me "The Holy Ghost taught me that 'by works a man is justified; and not by faith only' (James 2:24) means the opposite of what it states" all I can say is, -- Gee, who made you pope?