Addressing the OP, haven't read all the replies, I'm sure someone have answered it.. for me one verse, Romans 14:9 "For to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living."
this is why he went and preached to those (spirits) who was in prison. for God is not .... not anymore the God of the LIVING only, but of the dead also.. (this is WHY I know God as his own diversity/another tasted death for all men).. and knowing that, it answered you question, "For those who believe that unsaved man has free will to freely choose God or not", one scripture, Joel 2:32 "And it shall come to pass, that whosoever shall call on the name of the LORD shall be delivered: for in mount Zion and in Jerusalem shall be deliverance, as the LORD hath said, and in the remnant whom the LORD shall call."
that one word, "whosoeve" shows us that it is not set, but it incompass every "whosoeve".
well what do you mean 101G? scripture, 1 Timothy 2:4 "Who will have all men to be saved, and to come unto the knowledge of the truth."
and all men are the "whosoever shall call on the name of the LORD shall be delivered", or SAVED.. so God has set it for all to be saved, but it is "whosoever call upon his name, which means,
Romans 10:14 "How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?"
Romans 10:15 "And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!"Romans 10:16 "But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?"
Romans 10:17 "So then faith cometh by hearing, and hearing by the word of God."
Now if you're dead.... Romans 14:9 "For to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living." and remember our Lord Jesus is a PREACHER, so DEAD or ALIVE, no man "WHOSOEVER" have any excuse.
101G, Ss