Celebrim
Legend
No, what happened was a scenario that required a mind reader to properly navigate
No, it just required him to follow his Oath blindly even if he couldn't see how it could possibly lead to a good result, and even if it didn't lead to a good result.
Everything else about the scenario is speculation. We don't know if it was set up by the DM or by the actions of the PC. We don't know exactly how he planned to run it. We don't know what the session zero looked like. We don't know whether reasonable expectations were set before hand. We don't know what clues happened. We don't know that the OP made mistakes. All we know is what happened in game.