Brian Daboll begat Ken Dorsey, who begat Joe Brady. Daboll was the last Buffalo Bills offensive coordinator who was an external hire for the job, coming to the Bills from the Alabama Crimson Tide, where he coached recently-crowned Super Bowl champion quarterback Jalen Hurts and recently paid Miami Dolphins quarterback Tua Tagovailoa.
Since then, it’s been promotion after promotion for the Bills at OC, allowing continuity for quarterback Josh Allen in relationships while each coordinator added his own flavor to the offense. At one point, there was a conversation like this surrounding Ken Dorsey, with the idea being that he might be a hot name in head-coaching circles after overseeing a Bills offense with a future MVP at the helm.