In John 6:40, did Jesus die for only those that see the Son and believe in him, or, as you say, that he died for all mankind? What people did he die for? You are still eliminating the fact that God, by his foreknowledge, saw that no one would seek him (Psalms 53:2) and before they would seek him, he had to exchange their heart in the new birth, being born again (Ezk 11:19 - - 2 Cor 3:3). It is necessary for the cross for God's elect because it is a requirement that sin must be punished. I understand that you are trying to teach Dibby 53 the scriptures, the best way that you know how, but you are teaching him a false doctrine. John 6:65, Therefore, said I unto you, that no man can come unto me, except, it were given unto him of my Father. Only those men (women) that were given to them by the Father could come.
And to be clear, I am not trying to teach Dibby the scriptures. I am hoping rather to lead Dibby away from the false doctrine that corrupts the scriptures and is defined as such as Calvinism.