While star Kansas City Chiefs quarterback Patrick Mahomes reached a gigantic, 10-year contract extension which will pay him $45 million in annual average, Dallas Cowboys quarterback Dak Prescott will play out the 2020 season on the franchise tag.

The Cowboys had expressed interest in signing Prescott to a long-term deal all offseason, but ESPN's Adam Schefter reported they had not made contact with his camp in weeks.

As such, Wednesday's deadline came and went without Dak receiving a new deal, and this could have major salary-cap implications for the Cowboys.

Prescott seems to be betting on himself. He will make $31.4 million in 2020, and the tag number increases to over $37 million in 2021. Of course, all of that money counts against the cap for the Cowboys.

Ed Werder of ESPN noted Dak could count as much as $123 million against Dallas' cap in the next three seasons. Despite his new contract, Mahomes will count for just $71.6 million during that period.

Mahomes will make plenty of money over the life of his deal, especially on the back end. But the above tidbit makes it pretty clear why Dak would avoid signing, say, a five-year deal at a $35 million average. He can get more money just by playing on the tag before potentially hitting the market and receiving a more lucrative offer elsewhere.

In fact, K.C. Drummond of USA TODAY's Cowboys Wire wrote about why the Cowboys might not even be able to afford Prescott's tag number in 2021 in part due to potential salary cap ramifications stemming from lost revenue amid the coronavirus pandemic.

There seemed to be reason for optimism for Cowboys fans at the start of the offseason. Now, not quite as much.