It doesn't change any of the principles. We know from Paul's writings that those who lived by the same faith that Abraham had in God, in the Old Testament were inheritors of salvation. Those who did not, were not inheritors of salvation. In fact Hebrews hall of faith shows us that we can see people of faith (and therefore those who would possess salvation) all the way back to Abel - and most likely Adam and Eve.
Anyway, when those disciples in question heard the gospel from Jesus Himself, they had the opportunity to receive or reject it. Originally they accepted it, but when Jesus started talking about eating His flesh and drinking His blood, they left Him and HIs promises.
But what do OSAS people do with the fact that their doctrine takes away FREE WILL from anyone who gets born again? OSAS people are no longer allowed to voluntarily reject the gospel because so-called eternal security (not a Bible term) FORCES them to stay saved, whether they want that or not.
You stated, "But what do OSAS people do with the fact that their doctrine takes away FREE WILL from anyone who gets born again? OSAS people are no longer allowed to voluntarily reject the gospel because so-called eternal security (not a Bible term) FORCES them to stay saved, whether they want that or not."
It seems to me that your misunderstanding here may originate mainly from encountering only those who defend the OSAS position from the erroneous 5-point Calvinist perspective. In other words, if regeneration precedes faith as the Calvinist claims, then a person simply could not possess free moral agency ... no matter how hard the Calvinist tries to explain that fact away. Now, I can't speak for every person out there who holds to a non 5-point Calvinist OSAS position, but many OSAS Arminians, including myself, would clarify your misunderstanding as follows :
Every genuine, blood-bought, Holy Spirit indwelt, believer will naturally or organically desire [as opposed to being overridden by God] to serve and please their Creator and Redeemer as a result of the new nature they received when they first placed their trust in Jesus Christ [2 Corinthians 5:17].
1 Thessalonians 5:23-24 :
23 And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be [preserved blameless] unto the coming of our Lord Jesus Christ.
24 Faithful is he that calleth you, who also [will] do it.
As new creatures in Christ, they receive hearts that are compatible or malleable... hearts that will be responsive to the various means that God utilizes for their preservation. Therefore, man's free moral agency [although not viewed in an unlimited sense] exists both prior and subsequent to regeneration.
God's promises pertaining to the New Covenant :
Jeremiah 32:40, "And I will make an everlasting covenant with them, that I will not turn away from them, to do them good; but I will put my fear in their hearts, that they shall not depart from me."
Ezekiel 36:26-27 :
26 A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
27 And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
Also, the new heart/nature that every believer received at their new birth was received as a result of an unforced choice to place their faith in Christ's atoning work. The fact that a person possessed a choice in the matter certainly doesn't diminish the Sovereignty of God as the Calvinist falsely assumes ... but rather establishes it, that is, God Sovereignly granted/willed it.
The decision that they made to receive God's offered salvation carried with it eternal implications ... and I'm very confident that not a single genuine follower of Christ will ever regret the fact that they are now possessions of Jesus Christ ... eternally. Just as some decisions we make in the here and now carry with them irreversible ramifications in the physical realm, so it is in the spiritual. Aren't you glad that trusting in Christ's atoning work for your acceptance [justification] before God is one of them? I sure know I am!!