Yeah I agree with you, although I don't think its passiveness, as much as simply not being involved in the gameplan as much. Whether it's Brad that has to run more plays for him, or Isaiah has to look for him more and play to Horford's strengths, or Horford himself has to learn to play to Isaiah's preferences. It's still early though, so hopefully he gets going soon.
It's just a little discouraging that it took all of preseason and two regular season games and he still doesn't look like he is fitting in perfectly yet. Meanwhile, Dwight is playing pretty [dang] well in Atlanta. We could definitely use his rebounding lol