Crosby is not close AT ALL to Howe so stop arguing about it lol. The point has already been made in this thread with clear facts and evidence. Even if Crosby was healthy during those concussed years, he would still be well behind the big 4 (in this case Howe is apparently #4, which alone is questionable). The reality of Crosby is that he failed to stay healthy during his peak, which is huge in determining a player's overall career. He shouldn't be in this discussion, unless he somewhat makes up for his lost peak (he would need Hasek-like absurd peak in his late 30's-early 40's to make it a "big 5"). He could compile by staying near the top in a rather weak competition, but that's not going to put him in top 4 or 5). I personally put Crosby in the top 15-20 all time range, and if he continues to compile by staying "near the top" with playing well in the post season, he has the "potential" to crack top 10 all time. But thats about it for me. He missed to many games due to injuries, and lost some regular season scoring competition to a rather weak competitor (like Sedins and Benn). Being injured for a significant amount of time is one thing, but those were supposed to be his peak years. And he blew it.
Hasek should be #5, but that is because I value his career pre-NHL. In the case of Hasek, he had no choice due to politics to come to the NHL. It has been written several times in hfboards that he was one of the best (if not the BEST) goaltender outside of NHL in his early 20's. He was drafted in 1983 by the Hawks, and had he come over here earlier, I think his so-called peak/prime would have streched longer than the actual timeline. I'm not one of those people that suggests he would have "immediately" dominated the NHL, since it did took him few years to adjust to the life in North America, but even if you count the adjusting period, that would still make Hasek's career about 5-7 years longer. He usually gets negated for his "longevity" (which is absurd because this is complete BS), but Hasek's career is one of the longest in professional hockey (not saying the longest, but very very long). He played professionally from age 16 to late 40's. (he was attempting a comeback from Europe before the lockout began, and I believe he was 47 years old).
Hasek is one of those rare cases in which I would consider giving him extra credit for those missing years. It wasn't his fault that he missed those games, and he has proven in his professional career that he has absurd longevity, along with a prime/peak that dominated the league like no goaltenders have. His playoffs stats are usually underrated, mainly because he gets compared to Roy (who played for a great team, which is a fact), but it's not like he was terrible in the post season. As soon as he went to a championship caliber team in Detroit, he won the cup. He showed up big internationally, against a much superior teams.
This is different from say Crosby/Malkin fanatics giving them extra credit for those concussed/injury prone years. Injuries are part of who they are as a player, which is why I give no extra credit for not only Crosby but any player who missed games do to injuries. Hasek did miss games during his NHL career due to "questionable" injuries, and I give him zero extra credit for that as well, since it is his fault. Missing games because of politics/war/segregation are a different matter.
But with that being said, Hasek would still be a distant #5 for me, even with the extra credit. Maybe I could make a claim for Hasek over Orr/Lemieux giving that Hasek did had his absurd peak to go along with his insane longevity, which Lemieux did not have (same with Orr). Maybe even Howe, considering Hasek probably would have a better peak/prime than Howe compared to positional dominance. But that is probably giving too much extra credit, along with the "what if" game. As of now, he is easily in the top 10 for me, just by his NHL career alone. So giving extra credit for his missed years, and assuming that he would adjust to the NHL in about 3 years (like the actual time line), I would probably put him #5 comfortably, but still distant from the big 4 (It would be something like #1-#4: Big 4/#5: Hasek/#6~: Hull, Beliveau, Richard, ...etc.).