re: Kaepernick would reportedly sign with any NFL team -- even the Redskins

It's the constant media distraction that a backup qb would create for your team. There's a reason teams are willing to deal with media attention when signing guys like Joe Mixon and Tyreek Hill. They're high performers at their position so there's productivity that comes with it. Kaep is a backup QB that will be the only thing on your team the media will pay any attention to. If he were a top flight starter, he'd have been signed a long time ago because he'd be worth the distraction.