The Matthew Stafford-Jared Goff trade not only has whet fans’ appetites for big deals, it’s caused a social media frenzy about which NFL quarterbacks are headed elsewhere. That could happen with the likes of Carson Wentz, Jimmy Garoppolo, Deshaun Watson and Cam Newton. And with Teddy Bridgewater, Jameis Winston, Sam Darnold and Mitchell Trubisky. But don’t go getting the idea that half of the NFL’s starting signal-callers from 2020 will be employed by new teams in 2021. The quarterback carousel isn’t spinning out of control, mainly because of money. The COVID-19 pandemic has forced a lower salary cap for 2021. So any cap hits for trades involving QBs with mega-contracts will be built as much on finances as football skills.