Namaste sjr,
thank you for the post.
this is one of the reasons that a full fledged Geshe, which is a degree like one would get in a western university, takes nearly 25 years to complete. Buddhism is a vast subject matter to study...
above and beyond the simple study of the scripture it also includes the various philosophical schools that have arisen as well.
not to put too fine a point on it, however, the proof of the pudding is in the eating, so to speak. it's not the study of the words or concepts that is capable of liberating a being... it's the actual implementation of the practice.
as this is totally dependent on the will of the individual, rather than the intellect, the most brilliant and the most dense are equally capable of liberating themselves.
a "stream enterer" is a being that has been convinced of the truth of Dharma and thus is engaged on the path of practice.
one of the reasons, in my view, that Zen is so popular in the West is that it tends to place less emphasis on study of stura and abidharma and, instead, focuses on the praxis. this is not to say that scriptual study is neglected, it simply is part of the overall process. other schools, such as the Tibetan ones, place more emphasis on the proper intellectual view of the philosophies and, as such, appeal to certain beings.
it is said that there are 84,000 entries into the Dharma, each expounded for the varying capacities of beings. holding to one particular view as "correct" would seem to be a personal preference only.