Hi Trent,
Part of the problem, as I think you are discovering, is that the terminology is used inconsistently. People do not always mean the same thing by "Christocentric", "Christotelic" or even "two readings", which means that follow up questions are inevitably necessary. Some people associate "Christocentric" with typology on steroids (what we might call "Christotelic maximalism, where, for example, each of the judges forms a positive type of Christ) and therefore call themselves "Christotelic", when all they mean is "Christocentric lite". But at the other end of the spectrum, some who call themselves "Christotelic" don't see Christ as present in any meaningful way in the OT, and think that the apostles are engaging in a new hermeneutic (2nd Temple Jewish) that makes OT texts mean something entirely different from what their authors originally intended. And even people like myself, who would describe myself as firmly Christocentric can meaningfully talk about "two readings", the first, the one that would have occurred to the original audience and the other that includes all that we can see with the benefit of subsequent redemptive history. The key for me is whether those two readings are in principle harmonizable or deeply contradictory. So the first audience of Genesis is the wilderness generation with Moses; it's a useful question to ask how Genesis addresses their specific questions and concerns (for example, the role played by Egypt). That will often help us to understand how Genesis addresses us and our own temptations, even though for us "Egypt" doesn't have the same significance.
I think your follow up questions are getting to the heart of the issue and are much more useful than vague labels. I would want to hear people affirm a) the original authors understood some of what they were writing (for example, David in writing Psalm 110 understood that there was a greater king yet to come); b) the original authors didn't necessarily understand everything they wrote (David didn't necessarily know about crucifixion when he wrote Psalm 22); c) there is a fundamental unity between what the prophets thought they were writing (limited though their understanding was) and its fulfillment in Christ, so that when the prophets in glory saw the unfolding of their prophecy in the person of Christ, they said "Wow! That all makes perfect sense now" and not "No! That's not at all what I meant."