I wont be surprised if Indian pilots actually come up against a few Saudi F-18s in an Indo-Pak conflict. Although we can butcher them in air but I still think we should be prepared for that.
Saudi F-15s(only Kuwait operates the F/A-18 in that part of the world)-you are right on that part.For one,a large number of Pakistanis serve in the Saudi military,esp in the navy & airforce.Arab/muslim countries have also helped out Pakistan in the past Indo-Pak conflicts such as Jordan leasing Starfighters in 71.The worst part is Saudi Arabia's F-15S & the UAE's F-16 block 60s can easily reach Indian shores with fuel tanks.I wouldn't be too sure about easy air superiority for India.For one,Kuwait & the UAE(& probably Saudi Arabia) all operate the AMRAAM missile & also have AWACS,not to mention competent pilots trained in the US or UK.But India's ties with Israel particularly intelligence cooperation & armsdeals will help in offsetting that to an extent & the arabs are certainly not happy about it.