Why "Way to Fall" was Perfect for the End of Metal Gear Solid 3

WARNING - SPOILERS CODE RED
There will be many (unmarked) spoilers for Metal Gear Solid 3, and the other Metal Gear games in this post. Do not read it if you wish to avoid them.

Big Boss, with quite a way to fall.

First, have a grasp of the plot of Metal Gear, or this will make no sense. Second listen to the song here. It is accompanied by lyrics, read them there, listen carefully, or read them here. 

"Way to Fall" by Starsailor is an excellent song. And I really didn't like it when I first heard it. I was actually looking for the lyrics to "Snake Eater" (The intro song of Metal Gear 3). and saw it on the list of metal gear songs. I hated it. I liked the song, it sounded nice, but I despised the chorus. The chorus is still my least favorite part of the song, but I enjoy it now.

This song embodies Big Boss/Naked Snake (They're the same guy, and I'll go with Big Boss for the rest)  at the end of Metal Gear Solid 3. Funnily enough, "Way to Fall" was not written for it either. The games director, Hideo Kojima, came across it, and loved it. It was this stroke of luck that made the end perfect. I will now go through a couple part of the song, and how each part makes it great and is extremely appropriate.

"Son, You've got a way to fall."

The son here is quite obviously Big Boss, although there is no clear parent. "You've got a way to fall" is far more important, however. Big Boss does indeed at this point have a way to fall. At this point, he is a hero, having saved the world from a nuclear disaster. However, look at him here, as he is given the title "Big Boss" (End of Metal Gear Solid 3)-

This is the face of a broken man. He had to do something that killed him inside. He had to kill his mentor and mother figure, The Boss. And he had to do so because the plan formed for her screwed up. She went along with it, knowing that she had to die in order to avoid a war, and died a True Patriot (There's a reason for the capitalization if you're someone who isn't familiar with Metal Gear.) This ate at him, and truly began to fall. He becomes the villain, trying to accomplish the Boss' wishes by any means necessary, eventually forming a group known as "Outer Heaven." Outer Heaven is an extremely dangerous mercenary group, a place where soldiers could feel like they belonged, which doesn't sound so bad, until you look at how they accomplish it (eternal warfare). He had a good intention, but it went astray, and he fell. Hard.

"Oh, I've got something in my throat. I need to be alone, while I suffer."

The scene depicted in the picture above has him shunning everyone he knows, and despairing. He goes then, to the Bosses grave, lays her gun, and a bouquet of Stars of Bethlehem, salutes, and sheds a single tear. He does this alone, and never gets any true friends. He also suffers, greatly, both emotionally (His killing of the Boss eats him inside) and physically (At the start of the main game of  Metal Gear 5 [The Phantom Pain segment] he had been in a coma for nine years from severe injuries he had obtained.), eventually dying in a painful way because of a virus designed to target him, among others.

"Son, You've got a way to kill."

This applies greatly, provided you take it literally. Depending on how you played the game, Big Boss may have already killed a large number of soldiers. There is only one you are required to kill - The Boss. Later on however, the Boss kills a significant number of people through his missions, and through his soldiers, (And would have killed many more, if his Metal Gear had not been destroyed) and tortures some as well. This happens after the end of this game, so at this point he still has, again, literally, a ways to kill.

There are other parallels as well, but these are the strongest ones, and the easiest to explain. There are also some parts of it that go deeper than this, more into assumptions that I have no basis in game canon for, so I will, for now at least, keep those theories to myself.