Something else differentiated Kyouya to Hikaru and Tsubasa.
Kyouya is the only one talking about the blader's spirit. Hikaru and Tsubasa say they are going to battle Ryuuga, but they never talk about it. We don't even know if they believe in it. More importantly… Let's look closer at his quotes about the blader's spirit, in episode 49:
Kyouya: But I have the blader's spirit. This is how Leone and I fight and win.
Ryuuga: How nice for you two. Now I'm just gonna crush that spirit like a bug.
Kyouya: This is far from over. Go ahead and try but you'll never touch my blader's spirit.
And later
Dark Power: The only way to heal our wounds… The only way… to heal our wounds… We need blader's power to.
Kyouya: Okay, that's really nice. Go ahead, and try. But I'll never let you steal from me my blader's spirit. thinking Ginga, take a good look. This is my blader's spirit.
Kyouya doesn't only talk about his blader's spirit as something that'll help him win, he also says openly he'll prevent Ryuuga, L-Drago and the Dark Power to influence his blader's spirit.
I notice it because I search it to make this post… But Kyouya's spirit is the first one to help Ginga in episode 51. First as the shield preventing Ginga to fall
then as an added power
His spirit, even trapped by L-Drago's Dark Power, can make his own decisions and acts as he decides.