Let us use an analogy to show what you are doing. You have a class of 9th graders with an average make up except for a single child prodigy. They take a test and the average score is 86. In the next grade, the prodigy moves out and goes to a special school. The exact same kids could score higher but because the prodigy left town the average would go down to 84. It did not go down but the prodigy's high score skewed the grade upward and made it appear to go down. That is exactly what happens when you include A-Rod.
You say that contracts have declined or flatlined but that is not true. Look at my list of top contracts. If they have "flatlined", there should be as many 2008-2009 contracts at the top as there are 2011-2013. If you take out the outlier (A-Rod), the top 6 are from 2011-2013, perfectly in line with star contracts increasing.
The rest is just cherrypicking this contract against another contract instead of the big picture (which I supplied in my previous post). For instance, Josh Hamilton cost himself millions of dollars because of his off-field issues.