All elders have a weakness for this approach—the brilliant younger generation asks you to reminisce about your glorious past or to know some knowledge they are yet unaware of, and they look at you with eyes full of curiosity and admiration.
At such times, ordinary people always end up saying a bit more than they intended.
Mr. Silver Workshop wasn't foolish; he knew perfectly well that Ian was merely putting on an act. How could this genius he had watched grow up possibly have the expression of an ordinary child? At most, the young man was curious, but reverence was unlikely.
But getting Ian to play along was quite an accomplishment, after all, willing to put on an act for him was already a sign of respect. Plus, the matter wasn't particularly secret, so he chuckled and began to relay the details to Ian.
The history of the Dragon Worship Cult is far more than six hundred years—it has merely been 'famous' for six hundred years.