Here is why the case of Judas does not disprove universal salvation.
Because of the betrayal of Judas, Jesus was introduced to the woe of extreme suffering. It would have been better for Jesus if Judas had not been born.
Greek scholar Louis Abbott wrote:
"Let us look carefully at the Greek text: kalon ên auto eiouk egennêthê ho anthropos ekeinos, “Ideal were it for Him if that man were not born” or “It were ideal for Him if that man was not born.” The question is asked, Who is the Him? The answer is in the preceding clause. There we have the pronoun autou, “Him,” and anthropo ekeino, “that man,” both referred to in such a way that we cannot mistake them. “The Son of Man indeed goeth as it is written of Him; but woe to that man by whom the Son of Man is betrayed!” “Him” is the Son of Man, “that man” is Judas.
The Him cannot refer to Judas, therefore the text can be paraphrased as, “Ideal were it for Him (the Son of Man) if that man (Judas) were not born.”
That is the understanding that the syntax requires.
Therefore, Mark 14:21 does not contradict Col. 1:15-20; 1 Tim. 4:9-11; Rom. 5:18, 19; etc., all teaching the ultimate salvation of Judas."
MORE COMMENTARY ON JUDAS
“But what about Judas Iscariot? Doesn’t it say it would have been better if he’d never been born?
Matthew 26:24 “The Son of Mankind is indeed going away, according as it is written concerning Him, yet woe to that man through whom the Son of Mankind is being given up! Ideal were it for Him if that man were not born!” It would have been ideal (pleasing and peaceful) for Jesus (the Son of Mankind/Him) if Judas (that man) had not been born. It was nevertheless necessary for him to be born and commit his sin of betrayal in order for scripture to be fulfilled. See Genesis 6:6; John 18:11; Matt. 26:39
Concerning Judas’ title, “son of destruction”, John 17:12, the Greek word is apollumi, often translated, perish or lose. This word is used in the New Testament about 90 times. Many people, animals, and even things are described as being “lost”, “destroyed” or “perished”. It is unwise to assume the word describes “eternal damnation”. “For the Son of Mankind came to seek and to save the lost (apollumi).” Luke 19:10. The book All in All, by A. E. Knoch, is very informative on this and some other important topics, such as the eons, the 3 classes of vivification, “hell”, and “annihilation”.
“What About how the Bible says that those who do not believe will perish or be destroyed?”