If you're having trouble with your focus, make sure there's enough contrast for the lens to quickly focus the scene...and that you're using a fast enough shutter. (I'd recommend at least 1/250 for soccer. All other things being equal, this will slide you ISO into the 400+ range.)
Both the 200mm and the 70-200mm are very sharp lenses. I don't use teleconverters, so can't comment on how they might affect your focus, except they reduce your effective aperture. With a D4, so long as you don't get below f/8, the AF should be able to work fine.
I have my D4 set up so AF-ON initiates focus, and the shutter release button only trips the shutter. With AF-C, as long as I hold down the AF-ON button, the camera focuses. If I want AF lock (rare, in a sports shoot), I take my finger from the AF-ON button.
Fo sports, I use AF-C, 11 points. Focus Priority. (Like another poster said, I don't understand why you would choose Release Priority. I have no use for out-of-focus exposures.) As I said before, I rarely lock focus during sports shoots.
Depending on the sport, I use continuous High (10 fps) or Low (5 fps) most often, with occasional excursions into the land of single exposures
That's what I typically use. Experiment and find out what works for you.