[Aaaaand dodged a bullet. Thank you, Shun, for moving on to the lighter topic of how to properly quantify coolness. At some point, Ren does think he might tell Shun about his past mistakes, and not only because he's curious about shun's too, but...not right now.]

Mmm, I guess. You're not as tall as Tetsu... [Although he isn't that much shorter than Tetsu either.] But your coat and the way you hold yourself make you seem taller. And you're taller than me.

[Obviously, if someone is taller than he is, they count as tall. That's just how it works; he didn't make the rules.]

It's just cool because it is. It's hard to really describe why something is cool; it's different for everyone. And it's attractive because lots of people are attracted by strength and power, for lots of reasons. [Case in point: himself.]