Rambo 4's Other Plot

[Mr.Slave]

Just got done watching rambo(amazing) and i've been watching the special features. In the featurette "it's a long road: resurrection of an icon" sly says the first plot idea they had, was the daughter of his mexican house maid goes to mexico for the weekend and doesnt return. Rambo goes to mexico on a bloodbath rescue mission(somewhere along those lines). Lol, Sly then says that "it didn't feel right" because there was no explanation of rambo returning to the Us and what not. Could this be rambo 5?? That would have been one crappy movie. Your Thoughts.