Leads that come in with a different surname, phone number, and address (in the case of an unmarried partner, relative, etc.) are not triggered as duplicates and have to be manually added to the deal. These leads will still trigger workplan tasks to be assigned, even though they're unnecessary for the salesperson. A "Cosigner" option could tie these leads together on the same deal so that all the information, notes, and updates are shared on a single profile.