There is no need to conntect molex to motherboard if you have powered risers
My single board sample experience with my ASRock H110 Pro BTC+, does not match your suggestion. In order to increase the GPU count, I had to power at least (1) of boards molex connectors even though all my risers were directly powered. I used the same high quality Molex cable run for both connectors and can not comment on whether (1) would have been enough to make my board operate.
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