There's a good chance that there won't be a representative of Osiris at The Tower. And there's a reason behind this:
People thought that, at the start, Osiris was a Tower faction, like New Monarchy, Dead Orbit and Future War Cult, but Bungie said it wasn't true.
[spoiler]Osiris was the name of a warlock who was exiled from The Tower because he apparently came 'too close' to understanding the Vex. While I'm not one for rumours, The Trials of Osiris could be a homage of sorts to him.[/spoiler]
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Why would he be exiled for getting too close to understanding the Vex? Aren't we actually trying to understand them to kill them? Never understood this
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The old story to destiny was the traveler was the bad guy. And when killing the black heart you killed the traveler. Look it up
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That's one of those things that hasn't been revealed yet. Perhaps he wanted to understand them more to help humanity's chances to defeating the Vex for good. It clearly got the better of him; how we don't know. Perhaps we will know in the future.
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Osiris isn't the first case. The Ahamkara were killed off because they knew questions that no-one else would think to ask.