Hi ironpenguin.
Having worked in a few different yeshivos for various reasons, I just want to say a few things.
The reputation “on the street” about a given yeshiva is often different from what really goes on in the four walls on a given school day.
The labeling of boys goes into a territory which is anti-education. Boys dont come off the assembly line “good” or “bad” or “the right one” or “the wrong one”.
Some of the “standards” border or cross into gaiva.
Education is about developing young people; all of them.
Every young person is awesome and entitled to a great teacher to get to know them and work with them and develop them.
The positive to your brother’s situation is a matter of faith.
Regardless of the numbers of yeshivos you are talking about, on
a certain level, it just means they were not the ones entrusted to provide him with an education.
The school he will attend, iy”H, will be the right one where he will prosper because by accepting him, it shows they care about him.