By the way, I just watched the short vid you linked and there isn't anything immediately useful for us, as it only talks about people who lived in the 17th century and were buried there.
That said, still interesting, especially with some more googling afterwards! Apparently, people for the longest time assumed that the most elaborate and splendid coffin in the crypt had to be Dodo (I.) v. Knyphausen's, who was a big deal during the Thirty Years War and all - but it wasn't! It belonged to a woman, his daughter-in-law, called Occa Johanna, who became Oberhofmeisterin of the Swedish Queen, kept an all-female salon to discuss theology, and wrote a cookbook, among other things. She was the last person to be buried in the Jennelt crypt, so everybody who died afterwards was buried in a different church called Bargebur. Her son was another Dodo (II.), who was in Prussian service under great-grandpa FW, the Great Elector, as well as under F1. He also was Friedrich Ernst's dad, i.e. Ariane's grandfather. His wife, Hedwig Orianna (which seems to be the Frisian family spelling of the name), is buried in Bargebur, as is one of Friedrich Ernst's brothers, Wilhelm, who died in 1695, at only 19 years old, during the Nine Years War.
Re: FamilySearch
That said, still interesting, especially with some more googling afterwards! Apparently, people for the longest time assumed that the most elaborate and splendid coffin in the crypt had to be Dodo (I.) v. Knyphausen's, who was a big deal during the Thirty Years War and all - but it wasn't! It belonged to a woman, his daughter-in-law, called Occa Johanna, who became Oberhofmeisterin of the Swedish Queen, kept an all-female salon to discuss theology, and wrote a cookbook, among other things. She was the last person to be buried in the Jennelt crypt, so everybody who died afterwards was buried in a different church called Bargebur. Her son was another Dodo (II.), who was in Prussian service under great-grandpa FW, the Great Elector, as well as under F1. He also was Friedrich Ernst's dad, i.e. Ariane's grandfather. His wife, Hedwig Orianna (which seems to be the Frisian family spelling of the name), is buried in Bargebur, as is one of Friedrich Ernst's brothers, Wilhelm, who died in 1695, at only 19 years old, during the Nine Years War.