[StAnDeliver]

"What happens in the Supreme Court, like what happens in Congress involves a lot of inside politics maneuvering. Cases aren't heard because it's not the right time or the right circumstances or because they don't think the decision will go the right way. Nuances are a big deal."

You need a total of 4 Justices for cert, and in this case, the outcome was obvious: there was no statute preventing IU from doing what they did.

[Nero Germanicus]

This was not a cert appeal though. This was a request for an emergency writ, an injunction, to block the University’s vaccine mandate until a full petition for Certiorari can be filed.
Any one Justice can issue an injunction and if the judge for that region turns it down, any other justice can act on it,