I'm not an orthopedist, so I don't know what the possible ramifications are of a collarbone injury. It would obviously depend on
where the collarbone was fractured, and I'm not sure that information was ever released. But the clavicle does articulate with the acromion process at the top of the shoulder in what's called the acromioclavicular joint, so I'd be surprised if a collarbone injury couldn't affect the mobility of the shoulder in some way. In any case, either Rodgers is having psychological issues, which we've seen in other quarterbacks who have been hit too many times (and which I repeatedly predicted a few years back would eventually happen to him eventually), or he isn't fully healed. Or he doesn't give a shit anymore. I tend to agree with Kevin that it's physical issues. Hopefully, Rodgers has the humility to let the training staff tear him down and build him back up this offseason. None of these nonsensical no-dairy diets and whatever other faddish health trends he's been following the past few years.
Incidentally, the Vikings threw salt on the wound by absolutely destroying the Dolphins today. Nothing went right for the Packers this week.