I don't have a difficult time understanding how they came to that. They don't live where we live. They're dealing with numbers and county lines. They based their decisions on what they heard in the public consultations, which didn't come up with these concerns because they didn't exist under map number one.
I can't guess what their objections might be, but I suspect you're right about how they'll see this: everyone's happy, it doesn't contradict our mandate, it follows our own logic. My belief is that they didn't see that they were dividing these natural tendencies.
If they can solve the problem without a domino effect, or upsetting anyone, I can't see why they would object to it.