(apologies again for the lack of diacritics, I am still at home)
After several years, I could finally hold grasp of the editio princeps of Veṅkaṭanātha’s Seśvaramīmāṃsā. I found it in the University library in Kiel (too good that German Indology has managed to acquire so many important books!), in a volume collecting other works (see below), presumably because they were all parts of the same series.
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.
Camillo Formigatti works at the Cambridge Sanskrit Manuscript Project and is the author of many wonderful virtual catalogue sheets you can read directly online here. I met him only in 2009, while working at the first Coffee Break Conference, and now I wonder how I survived before without his acumen in the analysis of manuscripts as “things” and not (only) as carrier of a meaning