If you aren’t a die-hard Vikings fan, you probably don’t know who Kyle Sloter is, which makes sense considering he’s only been active for a handful of games and has never seen NFL action. But the Vikings have kept him around for a reason, and last season they kept him on the 53-man roster even though Trevor Siemian was locked in as the backup quarterback. This offseason, the Vikings lost Siemian to the Jets but signed veteran Sean Mannion to replace him. Then they scooped up former Washington star Jake Browning, who went undrafted after a remarkable collegiate career.