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WEBENCH® Tools/UCC2813-0: UCC2813 Webench Transformer question

Part Number: UCC2813-0

Tool/software: WEBENCH® Design Tools

I used Webench to do a design with these parameters:

The result used a UCC2813DTR-0.

The transformer was specified as follows:

My transformer guy's design put the Rs2 resistance at close to 100 m-ohms instead of 700 u-ohms.  I believe that this winding in the one that provides VCC to the UCC2813.

My questions is this:  Does this resistance really need to be that low?