Has anyone noticed that there is a clear similarity between Kyrie's 2nd theme and the beginning of the 1st movement of Buffardin's concerto a 5? https://www.youtube.com/watch?v=GnYqB7taiTY (someone else on YT pointed this out)
I find this quite interesting for a number of reasons. We know that Buffardin was employed at Dresden at the same time with Zelenka, and they obviously overlapped professionally. And apparently, Buffardin wrote only a couple of pieces, including the concerto, that were probably not even meant for publication. According to the wikipedia, the concerto was written as an exercise for Quantz (!), which probably means he was still studying at the time. This suggests the timeframe of not later than the early 1720's.
The question is then, why would Zelenka quote Buffardin, of all people, as opposed to say Vivaldi who was widely imitated at the time, in his probably most intimate mass? Or maybe Zelenka had suggested the theme to Buffardin and then later reused it in his own work? Is there a missing piece by Zelenka from his early days where this theme appears?