Thanks netnomad for testing. I still see an issue with my own ext2 usb bootable drive and will find a fix. The sytstemd thing in Jessie has provided a set of challenges that will likely not be seen the next Debian version upgrade.
But I am also of the mind that I would rather make one dCore that is excellent than have several that are in various stages of repair, which is the case of packages between the dCores available. Debian stable does not upgrade libraries or apps except for bugfixes in its lifecycle, and Ubuntu seems to upgrade more often which can cause breakage. So a Debian stable dCore as the official dCore is much more doable as there are so many packages and basically one dCore maintainer. The next testing version of dCore will be available when things settle down in Debian testing, I plan it next time to be more closer to the next Debian release so I can do this kind of bugfixing before there is a public dCore testing release. The Ubuntu dCores were a test of concept, and it would work with Linux Mint, Kali, etc. But again, better to support one good implementation than spread development effort across a number of concepts.
So for right now, "waitusb=5" or similar will do, and I will work on a fix that allows the LABEL to be specified in the waitusb command to maximize performance.