Here is a summary of all six cases:
Case 1 - Versatile multi purpose setting: 0,0,0. Adequate for larger birds in flight in open terrain, not flying right at you. The camera gets on the bird and stays with it if you stay on the bird. A good general setting.
Case 2 - Continue to track subjects, ignoring possible obstacles: -1,0,0. Example 1: When you’re locked onto a bird as it gets behind a floc, and you want to stay on the original bird. Example 2. A medium-sized bird in a thicket where you want the camera to ignore interfering branches as you follow a birds movement.
Case 3 - Instantly focus on subjects suddenly entering AF points: +1,0,0. You’re photographing a flock so it would make sense to pick up the closest birds as you usually want the closest thing to you to be in focus. Another scenarios is that you're on a bird and another nearby one flies in front of it, here it would make sense to switch focus to the near bird rather than the one now further away.
Case 4 - For subjects that accelerate or decelerate quickly: 0,+1,0. A large or medium bird coming right at you, coming in for a landing, taking off or buzzing by fairly quickly. An example would be where a bird leaps off the water, flies at you, and spreads it wings to land.
Case 5 - For erratic subjects moving quickly in any direction: 0,0,+1. Best for birds that change direction quickly such as leaping off a perch. Works well with 61-point AF expansion, and non-busy backgrounds. Best shot for this setting is to have the bird at a far left or right AF point in anticipation of it flying into the frame.
Case 6 - For subjects that change speed and move erratically: 0,+1,+1. Best for small birds that change direction quickly while in flight.
After all this experimenting, I decided to look up what Aurther Morris had to say on the subject, since he is a bird photography expert. It looks like I was off a little, he doesn't like Case 3 for birds except that he finds it the best one to customize. He says that every situation is different but for birds in flight you can't go wrong with this setup.