At first is when you are fooled to believe that venom snake is big boss
and later we would find out that he was actually a double and faking his identity to aid the real big boss
also the real big boss is out of nowhere secretly doing his thing in the shadows
while venom snake take all the attention so big boss can do his thing without being compromised..
And then at the later stage we understand that venom snake was actually the real big boss all the time
not literally but conceptually... he was the best version of big boss that existed 😭