I did look at that final. I saw the rain saturate the court and heavily affect the conditions, nullifying Nadal's topspin, allowing Novak to find his comfort zone.
It was completely different this year. Nadal was the one who should've closed in out in 3, 4 sets max. Nadal mentally broke down when serving for it in the fourth set and this is the only reason it even went to 5 sets. At 6-5 serving Nadal hit a BH UE and 2 FH UE and played the last point tentatively to allow Novak to hit an easy winner.
Again, I'm not sure what you're on about, Novak hit a very good deep return when Nadal served at 0-40, it was just that Nadal found something extra and smashed a FH winner off it. Novak then did a FH UE to bring it to 30-40, but let's not forget, Nadal slipped over to give Novak 0-30, so that cancels out. Then Nadal hit an ace to take it to deuce. There's no mental break down there, just Nadal's best serve of the match at that point that saved him.
Djokovic gets confidence when Nadal plays tentatively. They go hand in hand. Nadal started playing safer, trying to protect his lead and that's when Novak could sense it was his time to attack. Nadal only hit 2 winners in the third set until it was 0-40 at 4 all. At that point he knew he had to play more aggressive and when he did, he regained control of the match.