The
DAS was designed to work in conjunction with the Fast Pass Plus system.
First thing to do is create your My Disney Experience account as far ahead of time as you can for you and all in your party INCLUDING the person getting the DAS card.
Purchase your tickets ahead of time and link them to the
MDE account.
Make Fast Pass Plus reservations for your party ahead of time so that you know you will have three no-wait attractions scheduled before you arrive.
Then, when you get to the park, get the DAS for the appropriate person when Guest Services lines look short. REMEMBER, ALL PERSONS RIDING WITH THE DAS PERSON MUST BE AT GUEST SERVICES WHEN THE CARD IS CREATED.
For attractions that you want to ride using the DAS card, anyone in your party can get the return time scheduled on a solo visit to the attraction.
Whether or not you have/need a qualifying RFID media (card, magicband) is something you need to determine.