I think India’s interest is in the HAL FGFA which is the derivative from the PAK FA. As against PAK FA, HAL FGFA is a twin seater aircraft with added provisions for indigenous equipments like the BVR missile Astra.
True, in accordance with the IAF’s two-pilot standard for air superiority fighters, given that CAP missions can last as long as ~10 hours, so the workload can be split between a pilot and WSO.