We've really been missing Iggy's perimeter D. Outside the Spurs loss, we've either been killed defensively by good 3-pt shooting teams, or allowed bad 3-pt teams to have their best games in rhat area. Klay is great, but he's only 1 body. Livingston has taken Iggy's 6th man role (depending on the situation, could be Rush), but that hurts our true 2nd unit and he can't defend bigger players.
Last year, we wouldn't have worried about a loss or a close game here and there, but we've become such a well-oiled machine that we lose optimism when we are blowing everyone out by 30. It's all a trickle down effect because we've had key players out nearly all season, and the fact that we've come this far inspite of that is evidence of how great this team is. Just wait until (if) we get healthy.