What is the incidental sense of being, according to Aristotle?

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Aristotle didn't neatly box in (or categorize) "proper" and "incidental" causation.  For example a proper cause of a sculpture of a man is man-ness.  If the man is "pale" or "musical," that per Aristotle is incidental.  In farm-and-kitchen-speak, if you are looking for applesauce, it is incidental if you're squashing (no pun intended) a red apple or a yellow apple or a (ripe) green apple.

However, if you're looking with more determinate qualities of causation for the applesauce taste of a Granny Smith, you would deem Maria Ann Smith's cultivar to be proper and essential, and eschew Golden Delicious.  If you're Aristotle's sculptor, and you're dealing with paleness, you might elect La Pieta rather than David.  Bonus:  "The Pity" is what Nietzsche's subconscious may have been self-referencing when he claimed God died "of pity;" he needed Christ crucified as Way-marking for his own way-discerning, which ended up his more or less realizing he was both Christ and Buddha.