No, I actually think he would be bad coach, but good player. Anyway, you were at least arguing with arguments. So I respect your opinion and it has some logic.
But I still think that his potential and abilities + experience might be used very good in Na`Vi's CS:GO roster. In my opinion, he is at least better pick-up than those inexperienced kids like Sh1ro or Xsepower or something else. I think jR's motivation might be high asf if he will get an offer from Na`Vi so he is not washed-up like GuardiaN for example. And he is also more strong-willed and consistent person than GuardiaN.
So in general, in my opinion I just know him better than you, cuz I follow CIS scene and I hear everything from it. That's why you underestimate him imo.