let's get 2 things straight.
beyond the familiar relationship, brianna and avon were better suited and more capable of running the FAMILY business. stringer bell was nothing more than an overblown day player with delusions of grandeur.
if stringer bell really had the credentials (knowledge and experience), why did he have to consult a community college lecturer teaching night school for answers about his own endeavors?
stringer's "too emotional" speech sounds real nice, but when it comes down to it, it has no legs because he has nothing concrete to back it up.
where in the show did avon slip due to emotions?
where in the show did brianna slip due to emotions?
on the other hand, you'd need both hands to count how many times stringer bell's emotions got the better of him. ask slim charles to assassinate clay davis.