NFL analysis: Best backup-to-starter quarterbacks in NFL history as Kirk Cousins heads to Las Vegas

Kirk Cousins arrived in Atlanta almost two years ago to the day as a $180 million quarterback, undisputed starter, and the new franchise cornerstone.

Then, the Falcons front office shockingly ripped up the script, drafting Michael Penix Jr. eighth overall barely a fortnight later and nuking the franchise's relationship with Cousins almost instantly.