Let's talk bout Hyoga character development.

Hyoga's mother was not only a emotional support for him, but also a tool/presence of believing everything is possible.

I think Camus and a lot of people thinks his character growth has to do with becoming cool hearted and for that, to cut ties with his mom and consequently his soft and weak side. But that connection was his only motivation to stay strong and cool hearted actually.

That's why he was able to become a knight after all. Camus thought he was gonna die if seeing his mother was his motivation to become one. But he was wrong.

The moment Hyoga cries after being saved by Shun, changed the character emotional state. He became more vulnerable and open to other emotional connections. And then his character growth arc surrounding his coolness (wich is what everyone takes from his character) starts.

That's why after this moment with Shun, he starts crying so often. He had a emotional figure in his mother and that was it, but after fighting alongside his brothers he couldn't balance or control his emotional state that he let oppen (or as he said, rekindle).

One moment very interesting is the one he is running towards the artic ocean pillar and he says the real Camus took over Kasa's body to talk to him, and it shows the two things his character is all about, while saying his master returned to help improve his softness on the battlefield, he is being contradictory in believing his master returned, showing this weak emotional state and not even realizing. The other thing is that he still believes in the impossible (or dreams), wich was always the meaning behind his diving to see his mother.

A lot of people don't like the "repetition" of subject in his fight against Isaak, but his character never truly worked on this emotional side after being rekindled. Wich happens against Isaak, he was his first true enemy after Camu's lessons. In the end of the fight, he finally strikes a fatal blow. 

In the last image we see Hyoga's arc complete, not needing anymore to dive to see his mother wich always was a literal way of showing his "believe in dreams", and also saying that he won't see her because he made a vow, wich cements his cool state of mind. 

But inside the cool surface, his heart will always remains rekindled.

I have one of these for Ikki as well, if you're interested in seeing.

Hyoga's character development