The "preparation" also involves mental and emotional manipulation:
The episode concludes with the playhouse opening. As the opera begins, the carefully prepared "pieces" fall into place, leading to a chaotic shootout that leaves the Vanetti family decimated and sets the stage for the series finale. If you'd like to dive deeper, I can: 91 Days Episode 11
: Ganzo reveals to Avilio that he was the fourth man present the night Avilio’s family was murdered, though he claims he did not fire a shot. : Avilio intends to kill both Don Vincent and Nero Vanetti
: Avilio intends to kill both Don Vincent and Nero Vanetti. The Plan for Revenge
In episode 11 of 91 Days , titled "All for Nothing," the "piece" being prepared is the final stage of Avilio’s (Angelo's) intricate plan for revenge against the Vanetti family . The episode centers on the grand opening of the Vanetti Playhouse, a project that was Don Vincent's lifelong dream. The Plan for Revenge