Ah, but you forgot...
Joh 6:67 So Jesus said to the Twelve, "Do you want to go away as well?"
Joh 6:68 Simon Peter answered him, "Lord, to whom shall we go? You have the words of eternal life,
Joh 6:69 and we have believed, and have come to know, that you are the Holy One of God."
Joh 6:70 Jesus answered them, "Did I not choose you, the Twelve? And yet one of you is a devil."
Our Lord knew the hearts of people. As John states, "1Jn_2:19 They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us.
As for 2 Peter 2:20, Matt 13:5, and Heb 10, those are not examples but doctrine. All of them talk about false prophets/believers.
So in your “predestination” scenario it gets a little murky when trying to fit those in I would suppose.
I wouldn't count on it. I have a whole internet to supply me with references. ;O)
Why don’t you first explain to me how you believe that God can be the author of sin.