questions about battery disconnect wiring

67Dart273 said

That will work. There was a diagram of this floating around these parts. The only real difference between Crackedback and the above, is his method requires a separate "fairly large" (no6 or larger) to go up front along with the big main cable. His method keeps the big cable cold except for starting. If the no6 wire is properly protected, this reduces further the danger of high current shorts.

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I like that the ford solenoid means the starter cable is disconnected most of the time. But on second reading, I'm not clear if the alternator is protected the way you prefer.
The way I understand crackedback's panel, the alternator output goes all the way back to the continuous duty relay. So if either the disconnect or the key switch is opened, the relay interupts the output at the same time as ignition is killed. Is that quick enough to prevent flyback voltage?