I've played csz as a secondary since day one. He is nearly trash at this point in the games life. If he had decent bombs he would be viable at best. Dive kicks aren't winning him any majors.
His teleport is atrocious. You literally should never use it unless its in a combo to create a reset mix up.
The fact that most of his bombs do not freeze makes nearly all of his set ups a joke. Placing a bomb on screen scares no one. Even if you get frozen by it you are frozen in a juggle state. And csz can't get great damage off of a frozen juggled opponent.