This is my best guess from my observations of this thread. His posts translate more or less to "Dangit, I've been practicing this silly line of argumentation under the assumption that all I have to do is prove the Catholics all wrong. Now the mere existence of you Orthodox throws a spanner in the works for me. Please kindly jump into the Pope's end of the pool for a while so my argumentation seems less flawed."
Not at all.
My argument has been one that the very early church used. Show me the start of your teaching. Does it trace to apostles? Scripture? Can't be shown? Then that by itself says that it came out from apart from apostolic authority. It's a witness against itself.
You know, if it was good enough for Paul and Timothy, it's good enough for me.
Some groups, however, believe other than how the very early church did on things and how to determine heresy and catholic orthodoxy.
Now, at this point, folks can toss how the very early church decided heresy by saying, dogma evolves. It's not new per se, but it becomes uncovered for us as the centurities go by.
My question is how/why did OO "draw the line" the dydwits c455? How/why did EO "draw the line" the dydwits 1054? How/why did P "draw the line" the dydwits c1600s?
The fact is they did. Else they'd be RC. RC says the dogma of Papal Infallibility is always there. Those groups disagree.
Now, do they disagree because in fact there is NO NEW DOGMA or for some other reason? Anglian says, OO weren't invited, but if they were, apparently, they'd go to the next EC and agree, submitting to the Roman Pope. If not, why not? Thekla says, new dogma is not a new belief. Ok, and why isn't Thekla RC? Does she think the new dogma of Papal Infallibiility IS a new belief? How does she know that?
So, IMO, everyone draws a line. Some do it with better semantics and more studious words than others. But whatever. My line is simply drawn from long ago with those who first did so.