Sorry, I'm confused. What part is on the wrong track? That the trails have been pinched from the piece itself, or that they've been marvered in a bit, or both? I agree that it looks like it has been reheated, some areas more than others. In the most narrow section of the piece the trails still look quite distinct. For that reason, would it be correct in thinking the reheating was done with a torch, or can you localize the heat enough at the glory hole?
Hypothetically speaking, is it possible to pinch bits from the surface of a (different) piece and make threads if the glass is thick enough?