@Roadrunner9000 lol you're right, seems like the author makes use of his IQ like it was mana points, and now he is low.
And yes, there is absolutely no rational explication for those 3 to appear here except to create some completely absurd drama, especially since it's the 2nd time author uses the "bullies" card. The guy is so lazy that he probably reused the templates he had for the first bullies. Even the one with the scar on the left eye is still there.
Anyways, after reading this sh*t, i read "Kage no Jitsuryokusha ni Naritakute" which reminded me of what good manga should look like. tl;dr I dropped this one.