I thought that Rorschach was a Beta rational, his moral absolutism and desire for justice seemed to point in that direction.
I do agree that Osterman is probably an LII, though I do not agree that he was a contemptuous look at Alpha. I actually saw sympathy for his character, though you perhaps did not read as such or see it coming from a Gamma perspective. He becomes aloof and alienated from people and society without feeling too much of a connection to them as a result of his powers. He also has the power to do great marvels and to end the problem, but he does not do so, mainly because he recognizes through his prescience that he can't and won't. But I think that his character is also the sort of natural conclusion of what such a character with such vast powers would truly be like as opposed to being a critique of Alpha.
I do not think though that Ozymandias actually wins judging by the end though with the newspaper and the Black Freighter. Winning is about the long-term consequences and longevity of the actions, and I am not sure that Ozymandias wins in that criteria. In the end, Dr. Manhattan sides with Ozymandias not from a moral perspective, but from a utilitarian one stemming from the consequences of revealing the plot. But he distances himself finally from humanity with the suggestion that he has left to create his own life as the Creator.
Rorschach sent his diary to the extreme right-wing newspaper that he loved so much, and the editor of the paper tells some newspaper writer to use their own judgment. The newspaper writer has the diary under his hands. It remains to be seen whether or not it is published, and even if it is published, it is uncertain whether or not it will even be believed since it comes from this somewhat fascist, right-wing conspiracy theory source.