It will be a matter of hours before we can resolve this. First Standard run: 1 gold chest. First Expert run: 2 gold chests. It was possible before, but if its guaranteed now, the score works like this:

Standard: 4 gold/80 AP
Expert: 6 gold/90 AP
Ultimate: 6 gold/80 AP

Still progressively better to use Ultimate, and you get more bronze too. One thing I will say about this event, the Expert trash mobs hit HARD. One shot on Beelzubub. It felt like the boss died faster, but I'm way better equipped for this event than Garuda.