There are players available that would be starters and upgrades. Just a matter whether we would pull the trigger.
Eric Ebron is available. He may not be what people thought coming out of college, but he has still averaged about 55 catches the past few years in an offense that has never really featured a TE. He is clearly better than Hanna, Swaim or Jarwin.
As for the guys mentioned in the original post, I do think Mewhort could be an upgrade over Cooper but he has some of the same issues...mainly his health. Logan would be a huge upgrade, as would Johnathan Hankins. Either of the safeties would be a help, would prefer Boston but he is going to be expensive at a place where we don't normally spend money.
There still are a few guys that would be upgrades, just a matter of whether the FO will get off vacation and try to improve the team.