The 6 Republican states had even less actual standing. They were suing on behalf of a private company that did not have the legal right to sue. A private company that was not harmed by student loan forgiveness. Based on the idea that, if this private company is harmed, it MAY harm the states.
It would be like a Bank suing Mcdonald's for firing someone who owed money to the bank. "You can't fire him! That will hurt his ability to repay the loan he has to us!" Ignoring the fact that the guy hadn't worked a shift in over a year and had another job. Not to even mention that none of the relevant states had made any substantial effort to collect payments on those loans prior to this. It's utterly preposterous. It doesn't even pass a common sense test, much less any reasonable definition of legal standing. It's wholly illegitimate and partisan to allow that case to proceed.