‘Guelli, 61, faced a different set of challenges with each team at the start. On the field, things were going well for the Bills, led by then-coach Sean McDermott and franchise quarterback Josh Allen. The team was a regular postseason participant. Off the field, a new stadium and long-term lease were secured, but the Bills faced a challenge: how to sell personal-seat licenses – a one-time fee paid by fans to secure the right to buy season tickets.’