There is no number cited in the constitution about what constitutes a Full Court!
The original court had only six members!
There has been as little as 5 and as many as 10!
Yes, but the country will not accept a ballot dispute resolution based on some lower appellate court if the Supreme Court ties. The country is owed a Supreme Court that can make a final decision. We are going into an unprecedented election where vote by mail is being implemented in an extraordinary manner. Democrats have already hired loads of lawyers in anticipation of lawsuits. Republicans in the senate owe the American people a mechanism for finality, not chaos.