The problem is, the a4 bounty cache can be legendaries from the other 4 acts. The RoRG chance is diluted by 4x for the A4 cache, so the drop rate is significantly lower. It would be more like 6 chances for solo and 5 + 5 x .25 = 6.25 chance for the group runs. Still better odds for group doing full bounties, but not much better than solo doing just A1.
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