Hi,
Thanks for writing in..
You won’t be able to sync passwords between AD and ADDLS.
You need to use other products like MIIS or FIM .
AFAIK, Adamsync , initial full sync on the server and later on with delta update. This operation can be controlled with switches.
Follow below for mre info :
https://technet.microsoft.com/en-us/library/cc753547.aspx
Devaraj G | Technical solution architect