I'm in the same position with 1 Primary Account and 3 Sub Accounts. When buying the TTK digital dlc from xbox live the [b]USAGE RESTRICTIONS[/b] states [b]"The item you are trying to download is subject to usage restrictions. You can use this item on the first xbox 360 console you downloaded it to. Access to this item will also be granted to all users on this first console."[/b] So as long as my Primary Account has purchased exp1, exp2 & TTK all Sub Accounts should be able to access all content. It's been that way all the way through Dark below and House Of Wolves. The thing is on my XB1 all user accounts can access TTK dlc, so it can't be a policy issue... Having to buy the dlc twice for both consoles was bad enough!