RAC, data guard, physical stand by and impdp
When you drop user on primary then this will be also reflected on secondary site. Also impdp will work as expected. But when you are about to import large amount of data MAA might slow down the whole procedure significantly.

If you have enough experience with RMAN you might try:


shutdown and disconnect the secondary
import data into master
backup master using RMAN
cross-site-restore RMAN backup of primary on secondary node, thus re-initialize the secondary.


Although this approach might seem to be complicated it might be faster in large configurations.