I would suggest in order to bypass the weekly lockout of content like SCoB, one have to at least one player in the party that has not cleared the content, but only those who has not got drop that week could loot (like CT). This way, will allow player to get help from experienced player after participating in the practice party quite some time, and at the same time, if someone want to get a second chance to loot, one have to help out those haven't cleared the content yet. I don't think it would be abused by placing a dummy member in the party as the present lockout content requires all party member to be competent to complete confidently.