That's all true, but Nurk is carrying around a solid 60lbs more weight than PG. A guy that big will have a lot more pressure on his leg.
Also, PG came back for 8 games at the end of the regular season, but he was terrible. 15mpg, 9pts, 3 rebs, 36%fg. He was maybe 50% of where he wanted to be.
He was pretty bad for his first 4 games in the fall when he did come back too. So the first time he played an NBA game like his old self was November 4th, a full 15 months after the injury. It would take 3 more seasons until he evolved into his current MVP caliber self.
So now imagine it's early to mid December. We're around .400, and Nurk xrays look good. He's laboring up and down the court because he's out of shape, and he's useless on pick and roll defense because he can't move his feet quick enough.
Do you think it's likely, given our history with leg problems, Portland shrugs and says "What the hell, let's play him 28mpg" with their 25 year old, locked-up-on-a-long-contract center? The Jason Quick article writes itself: "Remember how ruined Sabonis was because the Soviets brought him back to soon." It's going to be very, very tempting to shut Nurk down for the season. It starts with "playing it safe for another month", and then we get so buried in the standings that at that point the team goes all-in on tanking for a draft pick.
We've been down this path with Roy and Oden. I'm tamping my expectations way, way down.