If someone replies to a mass (or group) text, the replies ARE NOT seen by the other people in that mass message. It DOES NOT work like a group message on your phone.
For example: You send a message to the Monday prayer group which has 10 people in it. One of those people sends a response. Only 'you' see it. The other 9 people in the group do not.
All responses come back to the INBOX in your PastorsLine account. Any user that has access to the number and/or group would see the message. This is based on user roles. So who sees it in PastorsLine is dependent on their role. More details about user roles HERE.