I think the main reason for doing this is if all the esc's are supplying 5V to your NASA, it's possible to get variations in the output voltages, this would mean the ESC's 5V could be 'fighting' against another esc's 5V, variations in ESC's are noticeable, some at 4,9V, some at 5.1V etc in this example a 0.2V difference causing an increase in current in the esc's as they are now effectively working against each other, it just wastes LiPo energy.
I have a DJI Naza-M Lite coming from HK, I'll lose the red leads on All but One ESC, you only need the 5V on One port, more is pointless, as the power connections are paralleled internally in the NASA.
It's not worth the waste, just pick the red wire out on all but one ESC ....sorted.
I know some will think having them all in parallel gives more power, not really, sharing power rails is a voodoo science, not easy to get balanced power sharing between all the rails, without a low Ohm power resistor on every 5V line to absorb the differences.
I'll probably just use a low noise UBEC for all my 5V needs, more efficient.