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You probably won't need AI Servo, but good to understand how it works. From a distance, most motion is likely to be side-to-side rather than front to back, and often you are perhaps most likely to shoot during a pause or high point in motion rather than in the middle of it.
I agree about using a single AF point and almost certainly making it the center point. With multiple points active the camera has to "guess" at where to focus based on which points trigger, and it is quite possible for the camera/lens to lock on things that you don't regard as your primary subject. Single AF point, unfortunately, means that your compositional options become a bit limited, but you can always crop in post. (Quickly switching among AF points is possible but not likely a good strategy unless you have a specific plan of what you'll shoot at a given moment.)
If you are far enough back and there is little forward/backward motion, you may also be able to get with using fixed focus. Manually or using AF, focus on the typical dancer position and then switch AF off. (Be careful to not touch the focus ring after that.) If you can shoot at a slightly smaller aperture this can work well. While you may want to shoot wide open for low light reasons, keep in mind that this limits DOF and requires more accurate focus. Any time you shoot in low light like this, especially with moving subjects, you have to decide which compromise among high ISO, large aperture, and short enough exposure times is right. Keep the ISO high!
Back button focus works. I don't use it, but I know that lots of folks do, so I won't speak against it. I let the camera AF with a soft or half shutter press and then recompose if necessary.
Dan
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