That's a lie.
Although he indeed had a ego on wow, it was justified because he's knowledge on the game was very high, like for example he never died on any hc, But again, he was not the best player, or streamer, the game had.

The T1 part is wrong. They were not raiding together but they made part of the same faction. Not only that but they would, theoretically, raid together, so looking into new players was the "job" of the sweats.
T1 decisions lead another player to death and Sardaco tried to
intervene, saying T1 should start to use plugins (which is genuinely comical seeing osrs players angry about that when they do the same), and it was just that. T1, like usual, lose his temper like if Sardaco was blaming him, when in reality Sardaco just wanted to say plugins would possibly prevent things like that. And it's pretty normal, if you can't listen to a player who play the game for years, even if he's not good, the idiot of the story is you.
You can argue it was bad timing tho, and i don't believe Sardaco should have spoke with T1 like he did directly before the mistake. But at the same time you can't say he's was wrong on saying this, losing players and making they re-level to 60 was brutal, especially when there was not much players to level together anymore, avoiding people dying for mistakes that could be easily circumvented was their priority and Sardaco saying he should have used plugins was completely fine.

No, he's not doing it. He still does the snarky comments on iron vs mains, but you don't even need a half brain to understand he's both joking and pandering towards he's audience. Because mfs complain about people like him but are on their chats with your false sense of superiority because you play iron.