Are logbook drafts created when using only a Stratus for logging?

No, logbook draft entries are not created when using only a Stratus for logging.  Drafts are only created when using the logging within ForeFlight under MORE > SETTINGS > TRACK LOG > ENABLE AUTO START/STOP.

To transfers a Stratus track log to the logbook, download the track log from the Stratus and use the SEND TO button in the upper right corner to send the flight to the logbook (non-draft entry).