The Real President had escape from the secure hand of Vendetta, and Recardo Dalisay decided to let him go for him to discover the truth. Even if the Vendetta would want to secure the President as mush as possible but he himself as a Person do not trust them then there is no way to convince him about the truth.
Finally as the President sneaks around and find his family seeing them in a church burial he discovered the truth when he overhear and see's about the conversation of The New President and PNP Chief killing him if they found him alive.