So can anyone explain the Ntrude tape? why did Big Boss send it to Venom? My thought is that Big Boss sent it to Venom so that Venom (fake Big Boss) would then give the mission to Solid Snake. Thus, Solid Snake would then take the mission and kill Venom (aka fake big boss). Thus, the Big Boss that appears in MG1 is actually Venom and the Big Boss that appears in MG2 is actually the real big boss?
Big Boss setup the whole Outer Heaven thingie, he sent Solid Snake there to rescue (Frank Jaeger)Gray Fox, but didn't think he would succeed due to being a rookie. So he sent Venom as well and Solid Snake ended up killing Venom thinking he was the real Big Boss.