I just ran the #s to see if that was accurate and it is but the flaw in your theory is once again the international component, when that is factored in Frozen crushed Snow White. The world has changed and the international #s now tell the real story.
There are a lot of armchair quarterbacks in this topic: the point being this ride is going to be a huge draw for Epcot regardless of whether you want it there or not. Even just having the meet & greet there for the brief time it was pulled a lot of families to Epcot when they otherwise would not have gone. Money talks.
That's my point. You can't include the international market that DID NOT EXIST when the other movies were released.
You can, however, get a reasonable idea of a films success when comparing it against a rather stable situation, hence adjusted domestic gross.
When you start tossing in additional markets as valid factors (not saying it didn't blow out the international market, no one can say that), you are including factors in your assessment that skew the final judgement.
It's like owning a chain of restaurants, then opening five more, and assuming that you have a positive sales trend. This is why you split core (generally over 12 months) stores from new stores, so you don't come to a faulty conclusion.
So, whether you choose to accept them or not, the Domestic Adjusted Gross, is the number to look at.
And, in that respect, Snow White is #10 in all time domestic gross...and Frozen is somewhere in the high 90s.