No doubt, I agree Wesley is the far better character. I was just struck by how Buck seemed to echo Wesley, if only on a superficial level. In fact, until the aforementioned conversation between Buck and Wilson, Buck didn't have much substance at all. Hopefully the show will build on from that moment.
I have rather seen the other guy, the sleazebag, as his right hand man given that he has far more screentime and he's a different character to the superefficient/cold charactertypes of Wesley and Buck. I think it was a good choice to have a different archetype be prominent in Fisk's inner circle. Having such a little shit is very entertaining to watch and while he started off a bit inexperienced and incompetent his mistake earlier sort of switched him into full on weasel mode.