The following article indicates all is not well behind the scenes of Luck. Milch has changed agents from CAA to ICM. Until this switch, Mann and Milch both shared the same agent under CAA. Any rift is pure speculation, with some hoping that Mann and Milch are not getting on with each other. Irrespective of their potential differences, I can't wait to see the fruit of their struggles. With such artistic friction and mutual accountability we can be sure to enjoy the highest standard of writing and filming.
Read more here.