The Facts: Swap one injured back for another. That's how it seems things are going so far in Miami's camp. One day after Arian Foster "annihilated" his conditioning test, earning him freedom from the physically unable to perform list, running back Ajayi is missing Dolphins practice, NFL Media's Jeff Darlington reported.

Diehards Line: Ajayi is on the practice field, but on the side riding a stationary bike. That should be encouraging enough to expect he and Foster to resume their time together in the backfield in the near future, though it is sobering to consider the running back vying for a starting job is dealing with a knee issue before the team has even entered full pads. ... Stay tuned. We'll follow up as needed.