This point is even clearer when you look at the history of IOA attendance.
2009 ... 4,267,000
2010 ... 5,949,000
2011 ... 7,674,000
2012 ... 7,981,000
HP "has sustained those [attendance] gains," as you said, is the chief point. Even at 4% growth for 2012, the total attendance is up 3.7 million from the low of 2009.
And something that hasn't been touched upon nearly enough in the discussions of TEA's numbers is the factor of guest spending.
It's my understanding that the attendance figure is a general barometer of a park's success, but the guest-spending numbers are what the management teams truly care about.
4.0% growth or 15% growth, there's still a lot of Butterbeer and magic wands being sold.
I hate when facts are mixed with big picture logic.
I'd rather talk Tangled toilets myself ....