Now see.... what if The Boss won her duel in MGS2. They'd use her DNA for project Les Enfants Terribles.
And so, we have "Taylor Swift". She is visiting Outer Heaven for her birthday.
Who is in Outer Heaven? Probably her biomom, The Joy.
So my theory is that Taylor Swift will become president... and die on the roof of the National Reserve, of adopted ninja-related causes.
It's a well known fact that during the battle on the bridge, when Snake asked the Boss why, she explained she was defecting by singing Anti-Hero. "It's me, hi, I'm the problem, it's me"