While it felt like momentum-killing padding at the time, in hindsight it was a good idea to expose Shinichi to Mitsuyo’s worldview and advice before seeking out Gotou for a rematch. She instilled in him the idea of not simply rushing to his death half-cocked, but rather constantly using the noggin in his skull to think of ways, no matter how unlikely or ridiculous, to keep living. In other words, to trust his instincts; the same instincts that drive all other living things on Earth to survive.
It isn’t all that unfair a fight. Sure, Gotou is nigh invincible and far stronger and faster than Shinichi, (I even felt that mega-punch) but he can’t kill him if he can’t find him. This was one somewhat glaring flaw, however; it seems odd that Gotou has virtually no idea where Shinichi is. For one thing, he’s human, which is Gotou’s food…why wouldn’t he be able to smell out a meal? For another thing, there are still Migi cells in Shinichi’s body, which you’d think Gotou would be able to at least detect a little.
Another glaring flaw is that Shinichi survives the fight early on mostly because Gotou takes his sweet old time killing him, because he doesn’t consider a human to be any threat. Shinichi could have possibly even talked him into letting him live, or at least run far enough away that Gotou wouldn’t bother fighting him. Of course, that means putting more innocent people at risk.
And that’s primarily why Shinichi confronted Gotou; not out of anger, or for revenge, or because he wants to be the hero, but to prevent others from dying because of him. With poise that would make Mitsuyo proud, just moments before Gotou skewers him, Shinichi remembers Gotou bleeding in a specific location. Lying in a pile of garbage, he picks up a rusty pipe and stabs the lunging Gotou with it. It turns out to be a vulnerable area, and it pisses Gotou off even more.
But stabbing him there also broke the link between the “head” and the “rest”, and as I had suspected after the uncertain fate of Migi last week, Migi himself became part of that “rest” and is freed when the rusty pipe introduces life-threatening toxins that make the other “rest” parasytes wake up and resist the “head’s” orders.
For the second time in just a couple of minutes, Shinichi is about to face his death, but this time all he can do is sit there and wait for the blow to come. That’s when the Migi in Gotou’s swinging killing arm meets with the Migi in Shinichi’s stump and BOOM, Migi transfers back to Shinichi right then and there, nullifying the attack. Shinichi’s so damn happy he’s back his eyes glint!
From there, the duo of Shinichi and Migi is more than enough against the severely weakened and uncoordinated Gotou. It’s very satisfying when Migi goes through him like a wire through clay and he explodes, bringing about the dawn.
Upon inspecting the garbage pile, Migi deduces that the toxins on the pipe that proved fatal to Gotou were proof that “there’s no beating humans,” especially if you corner them atop a garbage pile they made that they can use the contents of to kill you!
It raises questions in Shinichi’s head about whether parasytes came to be to reduce the population of humans, who have spread across the earth and ravaged the environment. Those toxins are representative of human’s status as Earth’s wasting disease…and parasytes could be deemed the cure.
That’s one way to look at things, anyway. So when Migi declines to finish off a member of his kind (to do so would be murder in his eye/s) and leaves Shinichi to decide, Shinichi initially hesitates to finish killing the slowly reconstructing Gotou. When taking enough steps back, Gotou, or what’s left of him, has as much right to exist and survive as Shinichi does.
Shinichi changes his mind again when he realizes that he can’t live his life all those steps back; not as long as there are people at risk, or people he wants to protect. If Gotounator re-coalesces, he’s not going to stop killing humans; it’s what he exists for. That makes him, in the arena of protecting one’s own small band of humans, not all of humanity, an enemy whose existence is intolerable.
Shinichi sheds a tear before finishin Gotou, and in the brief cuts to the writhing, reconstructing corpse, it does indeed engender a kind of primal human sympathy for the weak and struggling, even if we know full well the monster it will become if allowed to reconstruct.
Shinichi goes home, having done what was necessary to protect Mitsuyo’s village, along with ensuring he himself will be safe for the time being, along with his father and his beloved Satomi. Gotou is by no means the last parasyte, but he was certainly the toughest. I doubt anything tougher will show up in the finale, which I hope will focus on where Shinichi and Migi go from here, and in particular whether he plans to finally inform Satomi about his deep, battle-tested friendship with the little monster in his right arm.