Why? If someone with no official authority, but more "clout" turns up, then given the ritualisation of matters such as army command, he's very unlikely to be in "de facto command". He'd be in theory and practice an annoyingly meddling political interference, but that's another matter (and is probably a day-to-day occupational hazard of the job, to the point of making it about thrice as difficult as the mere 'thwapping storm barbarians' aspect, mind you).
Cheers,
Alex.
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