Why would Lucilius want the enemy to think he is Brutus?

When Cassius says, "Three parts of him is ours already", he is talking about Brutus and means that Brutus is almost on Cassius and Cinna's side. What is the reason they so desperately want Brutus to join them? Cassius and Cinna desperately want Brutus to Join them because Brutus is well likes among the people.

Explanation:

delfino 2: diez in the desert analysis: the story, delfino 2: diez in the desert was really about not giving up! that is basically the theme of the story, and also being more prepared. the plot of the story was about diez, the main character, traveling through the harsh desert with other immigrants. also, that keeping the group alive and getting them to their final destination. the setting of the story took place in mexico in the harsh desert.

what excerpt? i would generally think a.