Hon, this is a fact! You can read the articles. Like I said: Do some research!
If IU isn't that big in the west, how did she sold-out her concert faster than anyone? It was a 100% sold-out rate, btw! People literally sent letters to EDAM to change the venues and do a concert in a big stadium in the US, because too many people were in line! Also, IU is THE ONLY Kpop Idol who was nominated at the Cannes Film Festival for her movie, so she's not just a simple Idol. That's why she's bigger than any other Kpop group or soloist!
Now, please sit down, and shut up!
Not even IU herself or anyone at her label would believe she is bigger than BTS in the west. For every random fact you put here to prove your point that IU is more popular, I can pull up like 100s of facts for BTS (to give an example - BB charts, Spotify and Apple charts, Album and concert ticket sales, no. of nominations and wins on western music awards). So you are the one who needs to sit and calm tf down with your passive aggressiveness.