DRV8323: sense OCP configuration block diagram and sense resistor usage

Part Number:DRV8323

Hi, 

1. My customer is having problem for the sense OCP configuration, can the sense resister be config like below capture in one of our reference design? 

Will there be any concern if only use one sense resistor for the over current protection? 

I just want to confirm this because our EVM is suggest to use 3 current resistor: 

Please let me know if there are concerns using only one sense resistor for OCP protection. 

2. Can you also provide the block diagram of the sense OCP? 

3. if only use the sense OCP protection but not using the current sense output result, can these pin left open? 

(VFRE, SOA, SOB, SOC, CAL)

Thank you.