Darko played really good, but you can't ignore that Harimoto played well in Doha this year and in China in December. he beated Dima, Calderano, Ma Long, Jang Woojin among others
so for me its obvious the #1 problem is a mental one. under pressure he's not playing well as the favourite.
he was also given a warning by the referee because of his loudness in game 5 iirc, he immediately lost the 3 following points as if his mind wasn't there at all.
I think it gave him even more pressure later as well.
regarding his loss in national championship, last year to Uda it was a really tight match played at deuce in the 7th, nothing to be ashamed and nothing to do like today
and this year, he lost after playing 3 matches in the same day, the schedule was very hard. he was exhausted after playing a 7-game against a chopper and lost to Oikawa who is his training buddy (same Tleague team), so i think he has some excuses for this loss.
Harimoto had a passive / negative attitude. Jorgic had a good challenger mentality the whole game.