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In the zone focus and the large zone focus modes, you have no control at all over what focus point is initially used for tracking. Instead, the camera chooses what it thinks your intended subject is, and it does so by placing a priority on what is closest to the camera, and, perhaps, what has more contrast.
For that reason, I find the zone and large zone modes to be the two that I find the least use for. For most situations where I'm tracking a moving subject, I prefer to use 8 point expansion. And, even with somewhat busy backgrounds, I've found that all-point focus works well, but note that, with all point focus, you can, via a menu setting, choose to select the initial focus point used or you can let the camera choose the initial focus point, similar to the way it does with zone and large zone focus. Thus, if you are going to use all-point focus, I would suggest setting it up to allow you to select the initial focus point.
Unless there is absolutely nothing in the background that could fool the AF system, for the reasons explained above, I wouldn't even consider using the zone or large zone modes.
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