ChNNR talked last night about how, according to sutra, the accumulation of merit results in the rupakaya, while the accumulation of wisdom results in the dharmakaya. But Dzogchen disputes this, since merit is relative and thus cannot "produce" buddhahood - and rupakaya is simply a qualification of dharmakaya. Given that, I thought maybe the Dzogchen view is that rupakaya doesn't necessarily depend on the existence of sentient beings (since it is a quality of lhundrub, which isn't exclusive to sentient beings).
I guess a related question would be - does lhundrub automatically imply the arising of ignorance?
Because compassion, the ceaseless activity for sentient beings, is inherent to the natural state the rupakaya is not the cause of accumulation of merit. Accumulation of merit is of great importance to fully recognize the natural state, since it produce the auspicious conditions necessary. But the natural state is perfect in the three kayas right now, nothing needs to be added or improved.
I missed Rinpoche's teaching so I can't comment on what he said.