>>13633462Why not? You are claiming that immigration acts as a natural selector that nets you the most intelligent, successful immigrants.
Even though that's not true, because as I have pointed out, a large proportion of Nigerians in the UK descend from 1980s and 1990s asylum seekers, yet they are still a successful model minority.
But leaving this aside, and assuming you were right, it would be a great argument in favor of immigration.