Is there really a single author of the Yogasūtra and Yogabhāṣya?

The idea that the Yogasūtra (henceforth YS) and the Yogabhāṣya (henceforth YBh) are not two distinct texts has been discussed for the first way in a systematic way by Johannes Bronkhorst in 1985 ("Patañjali and the Yoga Sūtras", Studien zur Indologie und Iranistik). Philipp Maas in his published PhD thesis (Maas 2006) examined it again and Philipp Maas in his contribution to Eli Franco's Periodization and Historiography of Indian Philosophy (2013) dealt with it again in greater detail.
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