lists John Morrison and several others related to the Primrose family as creditors. This has been what has lead me to connect my family with yours in some way. There is a possibility they may have been in New England before moving to New Jersey.
The Archives mention a James Morrison who drown in a ferry accident off Long Island in 1763 as a resident of Sussex Co. I don't know whether or not this was Isaac's brother and his estate was unsettled until 1767.