Should every human being born of Adam be in glory?
Yes, in reality, according to what God has done, every human being who was ever born of Adam should one day be in glory, because there is none left out. The free gift is much more than the offense, so no one is excluded by God's provision.
Les teaches that in reality, according to what God has done, every human being who was ever born of Adam should one day be in glory, because there is none left out. He connects this to verse 15, where the offense of one (Adam) brought death, but the free gift is much more. The context also notes that in Christ, Jew and Gentile are all one body, so Jewish believers will not be left behind at the rapture. Yet the passage ends by asking why they won't be in glory, implying a condition not fully explained in this excerpt.
But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many.