Yosef's plan

Twice before, Yosef felt overwhelmed in front of his brothers, turned away, wept in another room, washed his face, and came back. In Parshas Vayigash he cannot hold back and clears the room. What changed? And if the Ramban says his dreams had already come true in Miketz, why did he wait until this scene to reveal himself? Rabbi Asaf Prisman reads the extra food, the extra money and the silver cup in Binyamin's bag as one plan, built on a halacha of the Rambam. It also says something about how to recognize a second chance when it arrives.