Would you be happier if he was running hills or stairs to get in football condition? I see no difference in risk vs seeing a video of him at a high school field stopping, starting and cutting routes. If I saw such a video I'd be starring at his foot nervous as hell and would be thinking - please be careful. However I have to understand these NFL players have surgery - go through professional rehab - then they start using that injured part of their body again.
I get that he could land on a foot, etc but I'd imagine he's not going down low for rebounds. He's most likely getting some conditioning in and being smart on how hard he goes. Can we never give a guy the benefit of the doubt?