That Court found you can't use use different standards of counting in different counties because this would violate the Equal Protection Clause and further ruled that any alternative method would exceed the statutory time limit for a determination of a controversy as to appointment of electors. But who knows what the issues might be this time. If there were a huge delay because of a flood of mail in ballots suddenly showed up and were contested they Court would wait for State Court rulings before getting involved. But I can't see Roberts letting Pelosi (assuming the Dens hold the House) to take over.