McCain (undisclosed) will start training camp on the the PUP list, Omar Kelly and Chris Perkins of the Sun-Sentinel report.
Williams could be caught in a roster crunch as he is one of six running backs in camp and the team will likely only keep four, maybe five. With Jay Ajayi, Arian Foster and Kenyan Drake all but assured of a roster spot, that leaves Williams battling with Daniel Thomas and Isiah Pead for one of the last spots. It would behoove Williams to get back on the practice field as soon as possible.