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Stray thought:
The only real reason for disabling the serial console at a specific point in the start-up sequence is because it was previously enabled in the start-up sequence.
Can you trace back the upstart sequencing to find something else useful about the serial console along upstart's path.
IIRC, there are tools to graph or trace the upstart sequence. Tools that can be run "cold", I.E: only the upstart directory structure is required, not actually executed.
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