Well, again, losing 4% of market share does not actually equate to losing revenue or profit because the market has expanded (in large parts due to WWoHP and then later NFL) over the same time period.
Both parks have had increases in attendance, revenue and profits during said time.
Also you can't assume the loss of potential revenue because its not safe to assume the total Orlando market would have expanded at the same rate without the addition of WWoHP.
I understand people (OP included) are constantly looking for some data to validate their POV but in reality this is not a zero sum game.
I think it was Jimmy earlier that posted this is a classic case of "the rising tide lifts all boats" and I think he is probably very close to the truth (except Sea World I guess
OT - even after watching Black Fish my family and I are looking forward to adding a day at SW this next trip for the first time since my childhood visit to SW Ohio some time in the 80's