Hi,
what do you mean exactly with "power bypassing"?
If you want to place the RZA in any low power mode, you need to still provide all the relevant supply voltages, that's how the device is specified (see hw manual, electrical sections)
So you cannot remove just one of the supplies.
At the same time, the values in the dc current requirements are in a kind of "worst case" scenario since they assume the cpu and all the clocks are on, at maximum speed
(one of the most consuming scenarios on the SoC) AND up to 85C (afaik it even includes deviation margin to take into account for "hot devices" in production), during normal operations
That's Japanese manufacturing quality and reliability :)
For low power modes (CPU and else off), you have two sets of values (above and below 50C)
In other words, the typical current consumption in an ambient temperature use case will indeed be much less than the hardware manual values.
The ideal situation would be to measure the consumption in your real application, using an eval board, and then add some (smaller maybe) margin for temperature etc
However, if you need to stay 100% on the safe side, you shall design with the worst case figures in the user manual
For lowest power mode, you could of course remove the supply completely, using some external logic
But then, you would need to undergo a complete reset sequence at power up as all the ram and register contents will be gone
Regards