Osiris is definitely still alive. He is in contact with both Eris and the Queen on the threat of Oryx's coming.
Toland's fate is a bit trickier, as we don't know whether he succumbed to the Deathsinger's Liturgy or not. But I believe I have proof that he is still alive and kicking: https://www.bungie.net/en/Forum/Post/150468655/0/0
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Did Toland ever have any conspiracies about the traveler not being what we thought it was? I know that Brother Vance and Osiris had warned about it in certain grimoire cards. It would be quite the coincidence that the people who speak out against the traveler are the ones that spent so much time studying our "enemies" I'm probably wrong tho lol
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I believe Toland simply worked to learn of the Hive and the nature of the Darkness. It was Osiris who questioned
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Oh ok makes sense