Well, Nadal needs to be physically fresh to beat Djokovic on a hardcourt more than any other opponent. The only hardcourt slam final Nadal ever won over Djokovic was 2010 US Open when Nadal cruised through the first 6 rounds like never before.
So he'd rather face Djokovic in the QF than any other round. So I'd say scenario 2 would be ADVANTAGE NADAL.
If this was at a Halloween Party, whoever dressed up as Nadal did a very good job. Looks just like him!