Thanks for your reply here to my post.
The expression "allegorical method" is imprecise. Probably the H-G method would explain it as finding a spiritual, additional meaning other than what was intended. The H-G method would distinguish between interpreting an allegorical text intended as allegory (which, although figurative, would be the "literal" sense), and an arbitrary allegorizing of a text not intended as allegory.
The word "allegory" is imprecise. The problem could be that of dividing literature into either allegorical or nonallegorical, when actually it is more of a continuum. This is suggested by Northrup Frye in his "Anatomy of Criticism", pp. 89-92. On one end of the continuum is the continuous allegory, such as Pilgrim's Progress, where every detail has a symbolic meaning. Frye places various types of literature along the continuum, such as the free-style allegory, Milton's epics, Shakespeare, metaphysical poetry, a central emblematic image in a work such as the Melville's "white whale", and then finally the other side of continuum with realistic reportage with minimal symbolism.
Frye also mentions that there are indirect techniques such as "symbolism not intended to be fully understood." C. S. Lewis said that "every metaphor is an allegory in little."
The H-G method might not be complex enough to handle all the types of literature along the continuum. Most likely much of the Bible does have more than one sense. Frye in his books on the Bible, explains how archetypes are repeated throughout the Bible. Some of these archetypes and literary patterns could be found in the text, whether the writer intended it or not, so that there could be several layers of meaning. Some literary criticism of the Bible gives complex chiasmic structures. I wonder whether the writer intended the structure or not. Some claim that is how the ancient writer structured his text. I don't know. There are also many passages that could have been intended to be ambiguous, and suggestive, lending an air of mystery and paradox, so that it is not clear whether there is another meaning or not.
Flexibility needs to be exercised, and hard-fast rules should be avoided.
Steve