The latest results from a participant whose family came from Belarus show a strong likelihood of sharing a common ancestor with the Bachrachs of Germany. I think this may be the beginning of a thread that will link into the rabbinic Bachrach families of Lithuania and Poland with the Bachrachs of Hesse-Darmstadt. We need to do more genealogical research before we can be sure, but my hunch is that there will turn out to be a connection.
One very notable detail in this 25/25 match: this participant has three extra copies of DYS-464, just like all the other Bachrachs so far. This is not a common mutation, so the likelihood of a connection is very high.