For whatever reason(s), Nazr was in Pop's doghouse this playoffs.
Aggie's points are very valid I believe. We beat Phoenix last year playing Nazr, and that team was every bit as fast as Dallas, considerably moreso if you consider Amare was at center for Phoenix throughout most of that series. Nazr had a couple of big games in that series because of the matchup problems he can create for a small team.
On top of that, against Phoenix last year Nazr provided defense around the basket that we were sorely lacking in this series. We couldn't defend in the paint at all, except for Duncan. Horry proved he's not really any quicker of a defender than Nazr, and Nazr proved he's a better three point shooter than Horry

.
What disappointed me is that we didn't experiment with Nazr and/or Rasho at all in this series. For anyone who says "we would have never matched up with Dallas' speed had we played Rasho and Nazr", just remind me. . .who is still playing? It's obvious the small ball didn't work and we didn't match up with the Dallas lineup by going small. I'm surprised at Pop, because last year he showed me he could adjust on the fly, and I figured he'd grown out of his tendency to stick with one mindset and get out-thunk by the Phil Jackson's of the world. . .but this series showed me he's still determined to stick with a single mode of thought, even if it's to the detriment of the team.
We don't know if playing our bigs would have worked in this series because we never did it. Conversely, AJ, despite Duncan killing them, played to his teams strengths in this series and didn't worry about necessarily trying to match what we were doing out there. Of course he didn't have to because we played to Dallas' style. AJ won the coaching battle in a landslide, but I'm still a fan of Pop. . .sometimes you just get out-coached, and Pop got out-coached.