  Note that there is no necessity that ‘qua’ operators be of the form ‘qua Y’, where Y is a noun phrase. For example, Aristotle says (De anima iii.4.429b25-6) that two things affect and are affected “qua something in common belongs to both.” Similarly, as evidence that ‘qua’ does not in these contexts always mean ‘because’ (usually, the context is too ambiguous to precisely decide whether it means ‘because’ or ‘in the respect that’), consider Nicomachean Ethics i.3.1102b8-9, “Sleep is an inactivity of the soul qua it is called good or bad,” but certainly not because it is.