I don't think sedan-based SUVs have adequate room (width) to accommodate "Captains Chairs". A simple way of looking at it is to visualize the space between the two front row seats where you have your arm-rest and storage. To a first-order, that's the same width that would be afforded to the ingress/egress space between the two captains chair for the 3rd row access. In reality, it is likely less than that because the 2nd row captains chairs might require arms rests that encroaches on that (already) narrow space. Captain chairs on van/truck-based platforms are more realistic.
While I am a big fan of Captains Chairs (as in my VW Eurovan), in short, I don't think vehicles like the Gravity will ever offer Captain's Chairs because of the space limitation.