His ankle injuries are not that bad, his chances of surviving a full season will improve if he elects to get the damage assessed and the ligaments tightened and I suspect if this season worsens that may be what he has to do to maximise his career. Excessive rolling is very common though amoung athletes and is very manageable, the missed time amongst pros is as much preventative than anything else. As a team you don’t want your investment doing real damage when a week or two off can manage the problem.
Anyway even if he doesn’t play a full season he will still be a top 8-10 back due to volume. Also we need more sample size at the pro level before he can be deemed injury prone, I think of him more Julio Jones than Jordan Reed, banged up rather than seriously limited by constant injuries.