Scar tissue is required for the ligament to heal. The scar tissue that forms the repaired portion of the ligament will always be scar tissue, but with proper rehab it will become much more functional and much more characteristic of ligamentous tissue. It will never be 100% as strong as the original ligament tissue, but you can expect the repaired tissue to regain 75-80% of its original strength. Obviously yes, that means it is not as strong as the original, and at an increased risk of re-injury, but if you look at the mechanism of injury for a PCL tear it is not something that commonly occurs in hockey.
As I mentioned previously in this thread, a PCL injury is best case scenario for Connor if he was going to injury any of the 4 main ligaments of the knee. Its role in the sport demands of ice hockey is far less important than the ACL or MCL, and probably even the LCL. This isn't something where you're going to see Connor skating or cutting up the ice and it's just going to rupture. He's going to need to have a guy clip him below the knee at high speed or crash into something/fall on it in just the right way like he did with the post.
Could he injure it again? Sure. Is it likely? No more likely than him breaking a bone in his leg.