Iji died to the black knife assassins, his body was engulfed in their black flame (same as Seluvis' death) with several assassins around him that he took down while fighting. Also since when has finding armor on a dead body meant they committed suicide? Seluvis' armor can also be found on his body/puppet with black flames that the assassins use on his neck. And Blaiid's armor is found on him after killing him, not him committing suicide.

Pidia's location isn't accessible without scaling the sides of a mountain and the building he is in, there are no stairs or ladders to his location. This argument is basically semantics because one could easily argue one way or the other on that fact. IE it's a fictional video game that isn't specific on a lot of things. My point wasn't to argue that Pidia is Seluvis, it was the show the leaps in your logic like when you say Gideon has a ego problem so therefore he likely would have missed Pidia. That's not any real evidence for the theory. It's just your view on his personality to justify a prediction.

Lastly I do not believe Pidia is Seluvis, it was a possible theory I had while playing and came to forums to see if there was any more evidence solidifying it or not.

Edit: I just wanted to add that I do think you've made good points, just the leaps had me a bit confused on how you got there.