BB turning up in that way would be cool. He'd still be a monster for allowing everyone else to wage war for him while he builds a Outer Heaven but maybe he's been in contact with Kaz and Ocelot, manipulating events to keep Zero's interest away from Outer Heaven, then the virus is unleashed on MB and as Venom panicks, have a breakdown after finding the tape with the truth, Big Boss is like that guy who killed
in The Wire.
Yep. This is how I'd like to see things play out, given what we know:
- Venom wakes up/is born (V has come to), and Ishmael/Big Boss guides him out with the help of Ocelot. The whole thing is intentional mindfuckery to sell Venom the confusion that he would naturally be feeling.
- Big Boss disappears until late in the game. He continues establishing Outer Heaven. Kaz and Ocelot are in on the ruse, and agree to build Venom up in BB's place to draw Zero's focus.
- Over time, Venom of course becomes invested in DD. So does Kaz, and this is exacerbated by the fact that he is captured and mutilated. He now sees DD as his personal arm of vengeance and strength.
- In one of his last acts of defiance against Venom and Zero, Skull Face unleashes the virus on DD and personally infects Zero. The only way to stop it is to kill the hosts. Zero sets out to establish the Patriot AI to continue his vision of The Boss' legacy.
- In an exposition-heavy scene, Venom finds out the manipulative truth, possibly from Big Boss himself. He has managed to obtain one sample of the cure from Code Talker. Rather than trust Huey or someone else to duplicate the cure, Big Boss makes Kaz take it, curing him. Big Boss murders Venom. Kaz protests and roars at BB to stop (that he doesn't have to do what he's about to), but Ocelot (who is either immune or also cured, and hadn't fully bought into DD as much as Kaz) restrains him and takes him away (plus, he's Ocelot, and gets a raging boner any time Big Boss shows up).
- Big Boss kills everyone in Diamond Dogs and destroys the base. Through this act, as well as the Zero-levels of manipulation prior to this, he becomes the "monster" Kaz refers to in MG2. Also, post-main story, you can seek out Quiet and murder her, too. She's a loose end and Big Boss has no personal connection to her.