Ioannis,
He maintains that deification is impossible without true dogma.
And according to you, it is impossible to know true dogma (ie. our interpretation of the Holy Fathers), without deification.
Conclusion, whoever is Orthodox, is sure "lucky" 
I contend in many cases, perhaps most cases, the Holy Fathers are not much of a mystery just like the ideas expressed by your doctor are not, or should not, be a mystery. In order to write what they wrote, clearly one needs to have reached theosis, just like in order to prescribe medicine, one needs to have become a doctor. But one should not need to be a doctor to understand the prescription and the explanation of the sickness.
Of course the writings of the Holy Fathers can be a bit tricky, mostly because of context, and for this and other reasons they can be abused (as with anything). But this abuse is almost always because of dark motives and a deliberate adgenda, not because of "innocent misinterpretations".
Your thoughts?