In all his time teaching at UA, Aizawa’s expelled 154 students.
But considering he’s thirty, he can’t have been working at UA for very long.
Maybe about 6 years at the most.
So, let’s we assume that all the heroics classes are 20 students each.
If Aizawa had expelled every single student in all 6 of the classes he’s taught at UA, that’d still leave 34 students unaccounted for.
And not to mention that, while we know for certain that he’d expelled an entire class of students the year before Izuku and the others started, he can’t have done that every single year he’d taught at UA (else there’s no way he’d still have a job there).
So like, there’s probably more than 34 expelled students that are unaccounted for.
You know what that means?
This binch is going around expelling other teachers’ students as well.