Ok, this is old, But includes a detailed analysis by the person who wrote the Z wave Tweaker, so hopefully it will be helpful. You can compare what is written in the following thread to the tweaker itself to see if anything has changed over the years.
Anyway, the point of including these two links is that if the MCO device is using multi channel association, it likely only needs the hub in group one and then it’s expecting the hub to use the endpoint information.
Also note that the byte structure Assumes that either the trigger device or the Target device or both can have multiple endpoints. That’s explained in the first link I gave. If I recall correctly, the smartthings overlay reversed the usual order of these, so people tend to get really confused, but the link I provided in this post should clear that up. hopefully. 