That's very interesting stuff. Those are the sort of forgotten details that add to any story. Do you think maybe sometime you could dig out the old gent's name? It suggest that Aurora, to whom Indian was farming out work, was in turn farming out work to other shops nearby.
The relationship between Aurora, Indian, and the Indian clones needs to be worked out better. And because early advertising claims and accounts are often unreliable, sometimes wildly so (Harley-D's "1903" claims being one perfect example), we should keep an open mind about who copied whom.