I skipped over this last night because I wasn't really sure what you were trying to say and I didn't really have time to think about it, but I'm looking at it again now and I still really have no idea what you're even trying to say here.
The conversation was never about the highest grossing movie*, it was about the top three movies per year. Ultron still came in 4th, not second, and all it would have had to do take 3rd would've been to at least match the same amount of money the previous Avengers movie made, which was not that much more than what Ultron actually made.
And applying this idea to 2017 makes even less sense, considering the highest grossing superhero movie that year didn't even make the top 5 (unlike in 2022/23).
Ultimately, it seems to me that (taking into account the entire point of the conversation in the first place was comparing 2015 and 2017 to 2022 and 2023) if the first two years just get a pass because 'nothing was topping Star Wars', then logically the last two should be viewed exactly the same because 'nothing was topping Avatar/Barbie'.
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*If the conversation had been just about the top grossing movie instead of the top three, the proper list would've been 2013, 2014, 2015, 2017, 2020*, 2022 and 2023 since superhero films only actually took the top spot 5 times in the 2012-today period. (And for anyone keeping score, it only happened once between 2000-2012.)