how it is creating dsource from standby to how vdb created with v2p option.
You can find our V2P documentation here: https://docs.delphix.com/docs/data-backup-and-recovery-solutions/virtual-to-physical and I think our document "How to provision a virtual and standby VDB" might also help.
If you want to get a deep view of the delphix's secret sauce take a look at one of greatest writing by (Jonathan Lewis) https://www.slideshare.net/khailey/ow-delphix-2
Also check some great writing video's by Kyle Hailey on his blog http://datavirtualizer.com/delphix/
But there is also sufficient information on delphix's public documentation https://docs.delphix.com/docs
Hope this helps.