Avira: Is it really true that “a large amount – perhaps the majority – of gedolei roshei yeshiva in America… are talmidim of Brisk? Even if they learned there for a year or two but spent the overwhelming majority of their development in American Yeshivos can we still call them Brisk products?
Also, keep in mind the question of cause and effect. Even if it is true as you say it does not give us a definitive answer that they are the gedolei RY BEACUSE they learned in Brisk. It is always very possible that Brisk attracted the best minds but not that they achieved greatness due to their time in Brisk