Yusuke was pathos. He was passion and instinct, and emotions were his fuel. He had no need for things to be planned in advance, things didn't have to just fall into place for them to work, for Yusuke they just did. There didn't have to be forethought, because Yusuke had the power to make things work for him, no matter what direction they were currently heading. This technique only worked for a few select, but Yusuke pulled it off perfectly. That was his area of expertise.
Kurama was logos. Sure, he had power and reputation, but his main strength came from his superior strategy. Every seemingly pointless action could be linked back and revealed to be so much more. He was so good that he could give off the impression of being beaten, luring his enemies into a false state of complacency, before striking out for a clean triumph. Of course this wouldn't have worked without Kurama's strength: the two relied on each other, pushing and shoving to create something even greater and more fearsome.
Hiei was ethos. Being a demon, he had time to develop a reputation, one of great power and an even greater fierce temper. This was only fueled by his possession of the Jagan Eye and the Dragon of Darkness. He was a master at maximizing the effect these two fearsome legends caused, keeping them under wraps until the battle was too far gone to be stopped and his opponent finally realized what it was that they were dealing with. At that point, it wasn't uncommon for Hiei's opponent's skills to simply cease as defeat loomed so visibly in their eyes. Then it was time for Hiei to easily back up the rumors of his strength and battle prowess.
Pathos. Logos. Ethos.
The three aspects of writing, of life. Together they completed each other, and when in balance forming a complete circle, a true masterpiece. The loss of any one and the whole work would suffer for it, but that was hardly a concern for the Reikai Tentai, whose purpose was to be there. Yusuke, Kurama, and Hiei represented three parts of a whole that when together could not be more complete, more perfect, more balanced. Or so said the Greeks.
But then, Kuwabara mused, where did that leave him?