The Grand had several buildings apart from the main building. Not sure why one more really makes a difference. There is also the wedding pavilion between the grand and the poly, definitely more grandish than poly, so not sure why it would change much.I'm not crazy about the DVC additions to GF or Poly either. There used to be more of a separation of the three hotels and now they all just run into each other with out-of-scale additions that call attention to themselves and detract from the main buildings.
As for the poly, the only buildings added were over the water. Did not move the boundaries closer to the grand.