The maximum number of fps is “always” Including AF/AE, it’s not just a theoretic number needing locked AF if it’s not specified. I have no doubt the 1dx3 does 16 fps with full AF/AE, the shutter speed fast enough is a given.
Those numbers are always caveated on aperture used, it takes more time to stop down than shoot wide open so frame rate drops, and also focus priority, if you set the camera to prioritize focus priority it will not give you the fps advertised, if you use the fps advertised (assuming you are also using a wide open aperture) then you will not get as many critically sharp images.
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