I think Hamlin makes it over Forrest just from the fact he knows the system already. However, if Cole Bishop isn't ready to start, I could see then keeping Forrest because I think he would be a better starter. But it could really go either way.
I don't actually think Cam Lewis is a lock this year, though. His guarantees aren't much, so it wouldn't be too much of a hit if he didn't make the team. Hamlin, however, has a much higher cap hit if cut. Cam Lewis is in competition with Jordan Hancock, though.