Those Miami High teams were great. With guys like Portillo, Gimel Martinez, Jose Ramos, Doug Edwards, etc. they formed quite a squad. On paper though, the most talented high school team in Dade County history might be the 1974 Miami Jackson squad aka the Jackson 5. That team went 33-0 and won every game by an average scoring margin of almost 30 points. Team consisted of 4 future NBA players -- Mychal Thompson (future #1 pick in NBA draft), Cecil Rose, Osborne Lockhart (Harlem Globetrotter legend), and Charles Thompson. The 5th starter on the team was Julio Davila, who also played Division I after HS and is still playing in his mid 60's.
Hankerson brothers were good. Not sure what you mean by "2 of them are the Hankers brothers" but no way are they top 5 players in Dade County history.