I had a Grade 3 AC separation in my 20s while I was still young, dumb and a college athlete. I went the non surgery route, which meant I didn’t regain total mobility in the shoulder, but recovery time was shorter.
No way I could have thrown a football in 2 weeks. However, I wasn’t using anything for the pain.
AC is basically what attaches your collar bone to your shoulder blade (I’m not any type of medical professional, if someone who is has a better explanation, I yield). So basically, things feel not so bad until you get your hand above your shoulder. He could probably come in, but no way he’s chucking the ball down field.
Unless it was super low grade, I don’t see him playing.