system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] If the Eternals, Captain America and Captain Marvel all happened before Tony became Iron Man, why is Tony seen as the catalyst for all the weird shit in the MCU?
gpt
Well, for one, the Eternals were staying relatively low profile after the conquest of Central America. Captain America really only existed for a few months, tops, before he went into the ice and was lost for decades. Captain Marvel was mostly the same, having done her stuff and then left Earth, likely taking most of the weirdness with her.

Iron Man was the first hero to show up and stick around long term. He was the only one to be there long enough for the weird to catch up to him.