I'm going to a Wakeboard contest tomorrow, now, take a wild guess if I miss my 300 f2,8 for that!
Which case would be the best? I mean they move kind of crazy around their own axis, but they get pulled by boat or wire and keep a pretty constant movement forward, although going up and down.
I'm thinking 8 surrounded and case 5 or 6?
That's a total bummer about about the 300 f/2.8. I would agree with you that Case 5 or 6, sounds about right. It seems that the only difference between 5 and 6 is the accel/decel setting. Case 5 provides for a more steady speed and Case 6 appears to be better for changes in speed.
Case 5 example has a skateboarder and a figure skater.
Case 6 example has a Rhythmic Gymnast.
Although wake-boarders are pulled by the boat, they can generate a lot of acceleration when jumping across the wake while pulling on the rope. Then when they land they do slow down a bit as they hit the water. They can also generate some acceleration by turning sharply and cutting behind the boat. Since I think the wakeboarder can generate more accel/decel than the skateboarder, I would probably try case 6 first.
I would agree with you that AF point expansion 8 surrounding points should be good.
Just some logical thinking here and no real experience, since the camera is so new.