It was the right decision to go legit though; when the indictments came down they literally didn't have anything on String because he stayed far away from the work & had no contact with guns. Without eye witness testimony, he would've destroyed any charges that could've tried to pin on him.
Avon got caught red handed with every illegal weapon in the city of Baltimore, all because he wanted to have some dumb War over a miniscule territory that wasn't even major part of their overall revenue share.
What did String in was his loyalty to Avon. He couldn't convince Avon that spending the rest of your life in prison wasn't gonna be worth all the bodies they would pile up in a War. String should've played the background & let Avon & Marlo duke it over nothing, then reap the benefits of the aftermath.