Maybe I’m in a minority opinion but I honestly don’t care about the backup QB position unless for some reason we’d have a solid high draft pick in waiting. Otherwise, if a team gets to backup QB for even more than one game your season is seriously affected. The Packers wouldn’t be what they are if Love was in there, KC’s offense wouldn’t exactly keep humming if Matt Moore or whoever backs up Mahomes is in there. When a backup comes in and grabs a win its great but for the most part your season is on a whole different trajectory if a backup is needed for multiple games or more. Every other position in football has more of a position group, as you’ll need to rotate in linemen, DB’s, etc. We all know the QB is the most important position in sports, and they don’t really have a backup in play at all.
To me it’s more of a financial transaction for the roster spot. Mond is still on a rookie contract so you save money by keeping him. Manion is no better and likely costs more. He’s been kept around as a solid mental companion to help Cousins but with a former QB as head coach and a lot of different and hopefully better offensive-minded staff, he’s no longer needed.