You ask for answers to draw on the works of reputable Christian theologians, so where better to quote from than the words of Jesus Christ when he addressed a bunch of learned theologians of his day?
Those scholars found Jesus perplexing, and they could not grasp his testimony nor determine the source of his miraculous powers. In John's gospel account, the whole of chapter 5 details their objections to what he was saying and doing, accusing him of being ambiguous. They were demanding that he spell out clearly who he was, where he was from, and why he was doing and saying so many things that didn't make sense to them. So, Jesus told them straight:
"Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me. And ye will not come to me, that ye might have life... For had ye believed Moses, ye would have believe me: for he wrote of me. But if ye believe not his writings, how shall ye believe my words?" (John 5:39-40 & 46-47)
They found the scriptures about Christ ambiguous because they had not searched them to find out about Christ. This meant that, despite all their protestations to the contrary, they had not believed Moses. Well, pointed out Jesus, if you don't believe what Moses wrote, you're never going to believe me. And so he left them to it; blind guides leading the blind (Mat. 15:14). So much for the learned, respected theologians of the day.
This shows that, in order to understand what the Bible says, we must believe all of it (whether our understanding is clear as yet, or not) and as we delve diligently into it, sincerely seeking to learn about Christ in it, the ambiguities will begin to melt.
It is the same when Jesus gave his account of the rich man dying and finding himself in torments in hell, and Lazarus finding himself in bliss. When the once-rich man protested that his brothers on earth would believe if someone returned from the dead to warn them of hell, he was told, "If they hear not Moses and the prophets, neither will they be persuaded though one rose from the dead" (Luke 16:20-31). This means that those who pick and choose what they will believe in the scriptures are just never going to understand. The writings will be full of ambiguity, apparently contradictory stuff, if not plain nonsense. And the more difficulty they find trying to understand scripture, theythe less they will bother with it.
On the contrary, those who have deep reverence for God's written word, will go deeper and deeper into it out of a heartfelt desire to "find" Christ in it, equally in the Old Testament as the New. Christ is the key to understanding the scriptures. He appears ambiguous to those who don't believe him to be the Son of God, but to those who have discovered him to be such, his words are sprinkled like diamonds all over the Bible, from the start to the finish, for Christ IS the Word of God.
There, then, is the theological explanation straight from the words of the greatest theologian there has ever been. They form a screening device to sift out those who sincerely desire to understand the Word of God, those who will not be stumbled by seeming ambiguities and puzzles.