First off, you're a round downer. LAME! 
Second, Shaq did lead KG in some catagories during that stretch whereas Pierce did not lead LeBron in any.
Third, For much of the LeBron/Pierce stretch neither of them had greta players playing along side them where as Shaq did which lowered the demand on him and his numbers.
Fourth, I said LeBron was better than pierce because he was statistically better in every catagory and their playoff track record was virtually identical.Where as Shaqs postseason track record dominates KGs in every conceivable way.
OK, let's work with this a bit. From 2000 - 2002, Shaq played in and won 3 Finals. KG was outstanding those years, but I have already said that I have no problem with stipulating Shaq was better in those 3 years to move the discussion along.
Now, from the start of the 2002-03 season until 2009, Shaq has averaged 20 points, 10 boards, 2 assists, 2 blocks, a steal and 3 TOs per game (rounded to the nearest whole number). He has won one championship. He has one top-3 MVP finish, and has won no other major awards. He has not led the league in any of the major traditional counting categories, nor has he led the league in any of the composite advanced stats that I know to check.
From the start of 2002-03 until 2009, KG has averaged 22 points, 12 boards, 5 assists, 2 blocks, a steal and 2 TOs per game (again, rounded to the nearest whole number). He has won one championship. He has three top-3 MVP finishes, including an MVP award. He has also been named the Defensive Player of the year in a different season. He has won the rebounding crown 4 times, has led the NBA in points scored in a season (2004), has led the league in PER twice, in win shares once, in wins produced at least four times, and in on-court/off-court +/- four times.
Summary: over that 7 year period, Shaq doesn't lead KG in any traditional stat, KG swamps him in the advanced stats, KG has won more accolades, and they have won the same number of rings. Thus, by the same argument that you make for LeBron over Pierce the last five years, I argue that KG has been better than Shaq over the last seven years.