Theory:
POTUS does the EO pertaining to mail in ballots.
Yuge court battle enues, jumps from circuit to appeals, blah, blah, blah
The Nov 3rd election takes place, mail ballots are counted with caveats, Biden and Trump, are both declared winners.
With election results still uncertain by Jan 20th house majority speaker becomes POTUS.
Here's the kicker, Republicans when the House, Pelosi would be the minority and MACCARTHY would be POTUS until election resolved.
MCCARTHY does the dirty work, enabling mil tribunals, EO's for this & that, SCOTUS finally makes decision on mail in ballots in Trumps favor, election results valid, Trump comes back in without blood on his hands.