All right then, the Chelish government has just come across an alien visitor with an intelligence of... Keltham thinks he was told 18, though at levels like these, the difference between 17.5 and 18.5 is significant, but let's say his intelligence is exactly 18 for now.
Is this alien visitor likely to be of any special benefit to heredity-optimization in Cheliax and Golarion, compared with just matching the same potential volunteers with a local man of Intelligence 18? Is he worth anything special from the Chelish government's standpoint?
Pretend you were just collectively tapped to advise the Chelish government on this, and can't ask Keltham directly! Also try to pretend that you're a dath ilani whose life experience trains them to continue thinking in the face of questions your teachers didn't tell you how to answer, including the part where you know and list the reasons you might be wrong.