By Alek Arend Last year, Drew Brees retired. Sean Payton then retired earlier this week. Now, the New Orleans Saints find themselves without a franchise quarterback, head coach and face a salary-cap disaster this upcoming offseason. The Saints were well aware the cap was going to be a major obstacle this offseason. Maybe that’s why Payton retired when he did. To maneuver through this offseason, the Saints may have to strongly consider trading Alvin Kamara. Former NFL fullback Michael Robinson discussed the hypothetical blockbuster trade this week. “I would say Alvin Kamara to the Arizona Cardi…