BQ25792: VBUS input only + back-to-back load switch

Tool/software:

Hello all,

In my application, I wish to use a VBUS input only option like so:

But still I wish to use an external back-to-back load switch in order to isolate the large VBUS & PMID capacitance from the USB 5V input.

It should look like this example, without the VIN2 option:

My question is: 

If I remove the VIN2 FET, should I leave VAC2 to be connected to VBUS (like in figure 9-3) or should I connect it together with VAC1 (like in figure 9-2) 

Thanks!

Nir