>> I don't see how i could form an opinion of Stoyan if his work is not available online,
I think I must be being too cryptic here ;)
I'll slow down, take a deep breath, and ramble a bit.
You asked me specifically about this line. Everything I have anywhere near this area of the tree is from Stoyan. I don't have much. I wasn't trying to have much. When I lived in NYC I had easy access to Europäische Stammtafeln and other sources so I had never worried about it. Then I moved to Boulder (Colorado) and didn't have the same easy access.
This was in the early days of the Internet, so when Stoyan's database came online whenever I had some time to kill I copied some of the main lines just so I would have them. I didn't think the Internet would last. I thought I was in a cultural desert forever. And anyway, Stoyan's search utility was a pain in the butt to use. It took less time to enter a whole line than it did to do even one search.
So, I just hit the highlights. Because really I would be able to check the info next time I was in NYC if I thought I needed to.
When you asked, the best I can tell you is I have this data, from this source that won't be easy to check unless you decide to buy the CD. Maybe you will but I probably wouldn't, so I'm guessing you might not either.
So, to be helpful I did a little searching. This one database, as poorly sourced as it, nevertheless matches what I have from Stoyan. Cool. That might be helpful to you. You would know this particular version matches something that came from a "good" although certainly not infallible database. Could be it came from ES. It's too long ago. I don't remember, and I never went back to NYC to check any of it. (For other reasons, yes. For genealogy, no.)
I hope next time you do a better job of reading my mind about why I'm saying stuff ;)