from my understanding you want the return pump AFTER the fuge... so all the water must flow through it in order to get to the return pump.
that still isnt having ALL the water pass through the fuge, and will not be as effective..
in both of your diagrams, there is water that is being returned to the tank without going through the fuge...
There is more than one way to run a sump/fuge setup...the "Flow thru" design as you describe and the "Pump in center" design as Tim describes...
I have run both and found the pump in center (split fuge ansd skimmer) much easier to control, more effecient in malnutrient removal, and the ability to "seperate" fuge from system (for maintainence) a great plus...
The system you describe is easier to set up, but not as managable...
But that's JMO...