To make a long story short, the 144,000 can be anyone today with the reincarnation for 10 groups among the 12 were dispersed even before Christ's time.

144,000 are about 0.1% of 100 million people (world's population in Christ's time).


Now, the Great Multitude! The first instruction of the Georgia Guidestones is 'Maintain the population under 500 millions'.

The Great Multitude will be about 484 million (< 500 millions) today's people (1 hectare per person in the NJ, hence the Georgia Guidestones' 1st instruction), so about 5% of the world population...if people accept to board benevolent ships. That could decrease to 200 / 300 millions if the anti-aliens / anti-UFO propaganda is efficient enough.

This means that being in the first group is far more selective because the former will govern the latter.