I have this same exact problem. I really need that Iron G-horn but I can't pre-order and I worry that if I do it on my bros account he will get Iron G-horn and I won't. I am seriously considering buying TTK on my account. If this is what I have to do I want to say screw you in advance bungie.
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I have all the expansions and season passes on my 360. I really hope I don't have to re purchase taken king just to keep playing. I have 335 characters but don't own any destiny discs for the one. :( I sincerely hope I don't need a re purchase of old content