How does drop rate accessory work when in a party

I would try on v2 personally next week. I'll let someone with 1x drop hit archer and pirate v2 until their hp gets to low amount before me doing the killing with 4x drop + greed pendant.
I will also hit the other 3 v2 until low hp, and let someone with 1x drop do the last hit. This isn't foolproof though but i guess its a start.
Well others are welcome to try too.