Hybridization of fruit trees is nowhere as simple as you would like it to be. A PhD is not necessary to comprehend it, but years of experience observing breeding and studying the outcomes is certainly a requirement to providing viable advice.
This conjecture of yours contradicts the publications of the Ukrainians, which I believe are all in the public domain.
You are not breeding anything, so it is not relevant to you.
For persons seeking advice I have started this thread: Breeding Methods for Fruit Trees