That is a stronger argument. Instead of focusing solely on combat positions, you are now highlighting the principle of gender equality. This argument can be further expanded upon in your third paragraph by providing examples and evidence to support your belief that men and women should be treated equally when it comes to draft registration.
As for your second paragraph, you can still describe the case but focus on the background, facts, and legal arguments that led to the Supreme Court's ruling. This should provide a more comprehensive understanding of the case while avoiding repetition.
For your third paragraph, you can then explain your disagreement with the outcome by elaborating on the principle of gender equality. You can also discuss any potential societal or legal implications of excluding women from draft registration.
Finally, your conclusion should summarize the main points of your essay and reiterate your stance on the outcome of the case.
Remember to support your arguments with evidence, such as legal precedents, statistical data, or expert opinions. This will strengthen your essay and make it more persuasive.