Considering that I wanted the Suns to play KT in the Spurs series and did not want to trade him, I'd like to say that the Suns lost due to KT's minimal minutes in game 1. However, I'm not sure that is the only reason. Another problem was that the Suns offense did not play very well in game 1.
In game 1 (106-111), the Spurs shot 50% from the field and had a big advantage on the boards. But they won by only 5 points in a game where the Suns shot very badly (by their standards at least).
Amare went just 6 of 19 (31.6%). In the other four games, he shot 40 of 73 for 54.8%.
Bell shot 3 of 8 (2 of 4 were for three). In his other five games he shot 24 of 46 for 52% and 50% for three.
Barbosa shot just 7 of 17 including 0 of 5 for three. He did not shoot well the entire series after averaging 47.6% for the season..
Jones played only 9 minutes, but missed both of his shots.
Diaw did not shoot much (3 of 5 in 25 minutes). but his shooting got worse for a subpar series.
The guys who played well in game 1 were Nash and Marion. Nash shot 11 of 18 for 61% but would shoot only 45.3% (34 of 75) for the rest of the series. Marion shot 7 of 12 for 58% in game 1 and continued to have a good series shooting over 50% (he took only 2 three point shots and hit one of them).
The bottom line for Game 1 was that the Suns shot only 46.4%. That is not horrible, but clearly not enough when the Spurs shoot 50%.
Game 2 (101-81), the Suns shot 52.6%
Game 3, (101-108) the Suns shot 48.7% (Amare played only 21 minutes and still shot 7 of 11)
Game 4, (104-98) the Suns shot 48.1% despite Barbosa shooting just 4 of 13. BTW, The Suns out rebounded the Spurs 42-32 despite KT getting only 5 rebounds)
Game 5, (85-88) the Suns shot 40.3% despite Barbosa shooting just 3 of 12, Nash just 6 of 19, and Bell just 4 of 11.
Game 6, (106-114) the Suns shot 48.2% despite Barbosa shooting just 5 of 15.
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Spurs
Game 1 (41 of 82 for 50%) (7 of 16 for 43.8% for three) (22 of 33 FT)
Game 2 (33 of 77 for 42.9%) (6 of 18 for 33% for three) (9 of 16 FT)
Game 3 (36 of 82 for 43.9%) (7 of 20 for 35% for three) (29 of 36 FT) The Spurs won the game at the line on a day the Suns shot badly at 18 of 27)
Game 4 (38 of 80 for 47.5%) (9 of 23 for 39.1% for three) (13 of 14 FT)
Game 5 (29 of 72 for 40%) (8 of 23 for 34.8% for three) (22 of 28 FT) Parker shot 5 of 13.
Game 6 (43 of 88 for 48.9%) (7 of 22 for 31.8% for three) (21-30 FT)
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In three of the five games KT started, the Suns did a good job in terms of defensive shooting percentage. In two other games they didn't really do a great job, but won one of them because the Suns got to the line more than the Spurs.
KT did contribute. It seems like he very effective in some of the games but clearly struggled in game 6: 4 fouls in 17 minutes, 2 of 6 shooting, 3 rebounds and 2 turnovers. Perhaps playing 36 minutes in game 5 wore him out.
The strongest argument for playing big against the Spurs was Tony Parker's shooting.
Game 1 - 14 of 22 for 63.6%
Game 2 - 5 of 14 for 35.7%
Game 3 - 7 of 18 for 38.9%
Game 4 - 9 of 19 for 47.4%
Game 5 - 5 of 13 for 38.5%
Game 6 - 11 of 27 for 40.7%
One final thought. Part of the problem with the Suns playing small was that their small lineup was not very effective. Diaw was especially unimpressive in the series, shooting just 12 of 28 and grabbing only 3.6 rpg in 20.8 minutes.
And while Jones shooting percentage looks good at 61.5%, his passivity did not. In game 1, Jones went 0 for 2. He did not take a shot in games 2 and 3 while taking only 1 shot in game 4. Even in game 5 when he played 29 minutes out of necessity, he scored only 9 points (4 of 6 shooting). His 3 of 4 shooting in game 6 in 21 minutes was probably his best game.
Throw in a banged up Barbosa who had a misserable series and it is amazing how close the Suns made the series. In any case, there was not great offensive advantage to playing small.