Well, your party receives a cube so long as a person did enough DPS in the party (that technically means you can have all 5 top dps players in 5 parties, dropping cubes for everyone).
But then there is some weird stuff that can happen as well.
Keep in mind:
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Fade drops all of your contribution, so if you see less than 5 dps in the rankings, they were possibly faded.
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DPS rankings can be buggy, if your off screen sometimes you don’t even get a ranking, but this doesn’t really seem to affect your contribution.
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Loading screens remove all contribution.
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Death during the bosses death removes contribution.
Usually, after following all those rules, drops make sense.
