Brothers Peter the Aleut and Serb1389 raised important questions, to which Sophia1925 may have already answered in part. I'll try it too, but words are often lost in internet conversation, and, also, I'm not feeling too well these days, so that affects my limited abilities to respond.
First we should make a distinction regarding education.
Education is not an attribute (a properties) that moves us closer to God. It doesn't affect our salvation. More educated, or those with high IQ are not closer to God compared to less educated pr those with not so high IQ. It is God's grace that matters. Although we all differ regarding our attributes and properties - talents, education, reason, will, knowledge, etc, the cross each one of us is carrying is just appropriate and fitting to our person. Have no doubt about it!
Though mentioned Holy Fathers are among the most educated and most intelligent of their time (and perhaps of all times), they just used their talent to systematize the teaching and to deliver it to us. They did it in the fashion apt to make the teaching easily understandable to each one of us willing to dedicate some time and concentration to read their writings.
But there is no misunderstanding in reading St. Ireneos of Lyons, St. Athanasios the Great, St. John of Damascus, St. John Chrisostom, St. Gregory the Theologian - they all made required introductory definitions and made appropriate titles of their works. One needs not to know Plato's teaching to understand the refutals offered by those Holy Fathers against platonists' teachings.
Yet, understanding them and reading them is just excercising our talents, and those more knowleadgable about it are not closer to salvation compared with those who don't for their talents are something else.
Holly Fathers haven't made their works about notions that can be studied by reason mystified. They are all clear. All one needs to study them is time and concentration. And their conclusions are like rocks, sound and clear to both a phylosophy doctor or a carpenter. The only prerequisite is knowledge that one can obtain by attending and listening Church services for some time, where our theology is sung.
Though I've heard arguments that, for instance, one can't understand St. Theodor the Studite so easily, or some other Saints, I can't affirm it - I haven't read them so extensivelly to remember.
Not so with so called "academic" teachers, and, to my impression (that I already explained several times until now) one could easily count Metr. Zlizloiulas among such "academic" teachers. Perhaps there is an explanation for such an approach, but I don't need it. Let those who study his teaching explain it to themselves and let them produce good fruits, so they can prove I misunderstood them. For we know them by their fruits.