What I ran into is that the Dell DTK 5.2 will not import into Configuration Manager with Dell Server Deployment Pack (DSDP) if you already have ADK10 installed. DTK 5.2 is not compatible with ADK10. So if you want to import DTK5.2, you will have to uninstall ADK10, reinstall ADK8.1, then install DTK5.2. I suppose that after that you could try to reinstall ADK10, but your boot images created with DTK5.2 will not have the ADK10 components.