It's not true that inbreeding leads to evolution! Where did you read that??

Inbreeding leads to a pedigree collapse. Human genes improve when the so-called "genetic distance" is greater. The greater the dissimilarities, the stronger the resultant combination. Don't forget that men have XY chromosomes that do not support error-correction unlike women's XX. The Y portion will change over time, whether losing or gaining information. That's how scientists could track changes in a bloodline from one generation to the next.

When you inbreed, the resultant male offspring's XY chromosome will have more errors compared to a non-inbred one. Inbreed another generation, and the errors multiply. Pretty soon you'll have a generation of basket cases who are unable to survive and they die off.