All major studies have pointed out that blacks have lower IQs than whites. Add to that fatherless homes and a environment where superior black children are blackballed for “acting white” and you could have the best teachers yet still have crappy scores.
Even if we accept that premise, the failure of those "best teachers" to convey measureable knowledge to the students would mean the teachers were NOT "highly effective." "Effective" means "achieving the desired outcome."
Of course, this raises the question of what is the desired outcome for Detroit teachers. We're only assuming that conveying measureable knowledge to the students is the goal. I'll bet 80% of Detroit teachers are highly effective at paying union dues, agitating for Democrat causes, using students to agitate for Democrat causes, concealing the financial misdeeds of administrators, and so on.
Add in a culture where black students who excel are derided by their peers and you have a truly hopeless situation.
Is anyone paying attention? This is Detroit, for crying out loud. I think the teachers should start out with at least a “B” for just showing up every day. I’ve read about student behavior in Detroit.