The Nations being judged was not something God had to 'fix' as all of Eve's children were destined for salvation. The order that is takes place is the only variable there is.That is a pretty accurate statement but my question would be, why would Ismael be less legitimate than Isaac. How bout Abram keep his pecker in his pants if the children he sires have to pay the consequences?
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IMO he isn't other than the first members of 'his tribe' isn't glorified until that later part of the day of return. Once the sinners are killed and the resurrection of the whole House of Israel is done then the Gentiles begin to have members come out of the grave. When Cain and Able come before Christ with the same offerings it will be Able's offering that will be chosen for the period called the 1,000 year reign. The Gentiles that are missing from that gathering will be there when the new earth verses start, they will be called 'the Flock'.