I agree with Phil Simms on the free agent receivers. None is a must have. It would feel like patchwork, something that probably wouldn't fully pan out. Wallace would be a great asset but also the receiver equivalent of what Reggie Bush is criticized for, looking terrific in some games then all but taken away in others.
Herock is correct on Jonathan Martin. I watched him against Buffalo and he looked acceptable. But I posted I wanted to see him against better competition a week later against the Patriots. He flunked that one. Martin is more natural at left tackle but he lacks top ability. Strength alone is not going to fix it. David Shaw didn't try to pretend Martin was definitely agile enough for left tackle in the NFL. He said, "That's the question."