I believe that Kagan is also mostly a QI supporter, given her generally deferential disposition towards the executive branch and its agencies. So your read on the bench’s leanings here seems to be almost entirely wrong. You’re unlikely to see a more friendly bench for challenging QI for years: Thomas, Gorsuch, Jackson, and Sotomayor seem to be votes against QI in its current form while Alito, Kagan, and Kavanaugh are votes for keeping QI.