I looked up the difference on Web MD to see how long it could take to heal:Pinto missed so much because he required surgery. Haven't seen anything suggest that is on the table at this point. Good chance he is ready for training camp, though they may take a conservative approach. At the very worst he should be ready for the AHL season. I'm pretty sure Pinto and White had dislocated shoulders as well, not a separated shoulder like Greig.
"How quickly you recover depends on how serious your shoulder injury is. Separated shoulders may heal over a period of 6 weeks. Dislocated shoulders may take longer -- more like 3 to 12 weeks. But these lengths of time are just approximations. Everyone heals at a different rate."
I think more time than that would be required for a hockey player to heal completely and get into game shape.