I'm someone who thinks that had Lemieux been healthy, he likely would have ended up ahead of Gretzky. But the fact is, he wasn't, and I don't believe he did. In reality, size does matter. Lemieux had that, where Gretzky didn't. But, if you can't stay healthy, size fails to manifest its reward. I'm not talking about something like cancer here. That can strike anyone. But Lemieux didn't seem to be able to hold up to the physical aspect of the game the way he might have been expected to.
At the end of the day, the point for me is that Gretzky milked the most out of his abilities, and Lemieux didn't. I think it's entirely debatable as to who had the better tool kit, but no matter who's was better, it's close enough that Gretzky's far superior execution of his kit means that he's the clear winner between the two of them in my mind.
As for Roy vs. Price? I think it's worth mentioning that Roy finished 7th on the board's top 100 players list. While that's a bit high for my taste, it's far from unreasonable. Price is up for discussion in the 181-185 range right now. My gut says he's probably going to make it in there. Again, while I'm not as high on him, I'm not going to say it's absurd either. But basically, we're looking at a gap of ~175 spots between the two of them, assuming Price goes in now. There's plenty of room for disagreement among people about how players rank, but there are enough very smart people on this board that have been involved in those projects (not trying to lift myself to that status, but I've been working with some very smart people in the top 200 project), and it's totally inconceivable to me that those folks are going to miss something that badly. Price over Roy is a total non-starter.