Sorry for necro-ing this old thread, but my question is also related to the shadow spawn ability, and why start multiple treads:
Do you treat the shadow spawn (which the text says is "under the command of the shadow") as a minion for that shadow (i.e. requiring the shadow to spend an action to Command the spawn to give it two actions) and only after the death of the origin-creature does it stop being a minion and becomes a fully independent ("full-fledged, autonomous") creature?
Or do you use the (much more powerful) interpretation that the spawn starts out being able to act fully independently and is only "under the command" of the shadow rp-wise, similar to how a soldier would be under the command of their superior officer?
Unfortunately, the text doesn't give any clear rules on how to handle this "spawn", but for the latter interpretation, the difference between it being a shadow spawn under the command of the shadow and then later becoming a "full-fledged, autonomous shadow" seems rather minimal, especially for those spawned by a greater shadows.