I'm not to worried about Matthews. He missed parts of camp last year due to tweaking his hammy and he still made it through the season with little issue.
I could definitely see the team putting Starks on the PUP to start the year. They're definitely going to wait to the last minute (i.e. the cut down to 53) before deciding to put Harris and Bigby there as well since both could conceivably be healthy enough by the time we play the opener @ Philadelphia.
I'll probably be in the minority, but I still wouldn't mind seeing the Packers bringing in Westbrook and seeing what he has left in the tank. He still strikes me as someone who could be a good 3rd down passing option behind Jackson and Grant.