First of all Mailchimp removes this person from the actual list and puts the contact into the “unsubscribed” on mailchimp.com. After performing a subsequent sync with Marketing&Chat this contact is also being removed from the corresponding group in Daylite and put into the “Unsubscribed” subgroup. As a result this person will no longer receive the newsletter and you won’t be able to transfer this person back to your list using Marketing&Chat.
If you would like to manually unsubscribe a person from a mailing list you can do so by removing the contact from the corresponding Daylite group and subsequently sync with Marketing&Chat. This will remove this person from the mailing list as well.