Possible, but not likely. Maybe Albert and Byrd, but definitely not Johnson. I'll give you 3 reasons why it doesn't happen.
1. Does anyone see Philibin giving a thumbs up to signing Chris Johnson?
2. While Chris Johnson will probably not get the superstar contract he had with the Titans, he's still likely twice as expensive than any of the other backs in free agency.
3. Johnson doesn't fit our scheme. He's never been a patient runner that could set up blocks or find the cut back alley. We're a zone blocking team and our backs have to practice patience in letting the running lanes develop. When Johnson is at his best, its in a scheme with designed holes.