Orthodoxy also holds that tradition is just as valid as the written word. In this case, tradition verifies the text.

Holding tradition as being as valid as a written reproducible document unfortunately does not remove the error introduced to by oral tradition, -especially those errors compounded over several decades. Unfortunately, no oral information set in existence has been able to demonstrate zero corruptibity over an observed period of decades, let alone years. This issue is mitigated somewhat if you accept that the Bible is not the literal word of god, but not entirely.

Merely holding something to be so does not make it accurate or valid empirically, especially in opposition do evidence to the contrary. That's the main problem that a skeptic would have with this and it can't be EFFECTIVELY addressed through reason. Observable evidence does not support traditional arguments that some sort of higher respect or reliance on oral tradition magically reduces error rates anywhere near zero. Especially on multiple large stories.