Well, I'm indifferent to the ending of "part 1" of this show.
There's a lot of really cliche reveals here, but only one that's relevant to me.
Gai admired Shu for being, for lack of a better explanation, a badass when he was a kid.
So when shit got real, he decided that he would become a badass like Shu was.
Now, the cycle repeats itself, with Shu admiring Gai being badass, and Gai telling him to become like he was before.
I would like to hope that the whole cycle ends up with Shu's balls dropping and part 2 being less emo.. they gave Shu his coat, hopefully that has some kind of "manning up" device in it.