I don’t think exclusives really work because of current casting trends in the industry. Back in the day, casting directors seemed to harmonise and would collectively make models stars, but contemporary casting directors are definitely more individualistic and seem less interested in who their peers are casting. This has been good for diversity but they’re definitely too fickle and show little loyalty to the models they cast (Edward Kim & Michelle Lee for Dior, and Ashley Brokaw for Louis Vuitton (but only Louis Vuitton…) are the exceptions).