Here is the question we don't seem to be asking. Will the extra 2 weeks make any difference to his overall health?
If I were 100% sure the extra 2 weeks would make a big difference, then, of course, I would sit Edelman against the Dolphins. But the fact is that we don't know if it will. Also remember that Edelman has been practicing for almost 3 weeks now. We've seen him running full speed cuts (or close to full speed) a couple of weeks ago. He has already put a lot of torque and pressure on the injury over the last few weeks. How much more would 15-20 reps in the Miami game put on them. Sure he'd be a risk of injury just like every other player, but not the specific injury itself.
If the 20% re-break stats are true, then it really doesn't matter if he plays Sunday or two weeks later. If it's going to break it will break either way.
Bottom line - If he's ready to play, then play him for a half. He's been out for a long time now, and he really needs reps to get back close to full productivity. Getting some playing time will help. OTOH, I'd take the opposite tack on guys like Amendola and Hightower. Missing this game isn't going to affect their productivity short term, so I'd be good with sitting them for this game