Pretty funky that the F1 is almost exactly Cumari Pollux. I did a quick search on dominant wild genes in Capsicum but I haven't found a lot yet.
What made you decide to cross with Cumari Pollux? I really like the way they grow and I love the pubescence of the stems, but with me, it was more curiosity than anything. I also wanted to try some crosses with CAP 214 (wild C. Baccatum var. Baccatum) but I'm going to postpone that until next season.
Well I'll try to explain it to you.
1. Imagine a recessive gene pops up. It's a gene that makes peppers not be spicy, let's call it c. The capsaicin producing gene is C.
2. Since the pepper is not spicy then it has to have two recessive genes, let's call that allele cc. Now that pepper would probably get pollinated by another pepper since wild fruits easily cross-pollinate. The pepper that produced the pollen probably would be a spicy or a capsaicin producing pepper since mutations that cause recessive genes are rare . So it's CC. The seeds produced from that outcome are Cc.
3. Now repeat step 2 but use the Cc as the mother plant, you get a 50/50 chance of getting a Cc or CC allele. So far half the descendants are CC.
4. Repeat step 3, now 3/4th's of the descendants are CC.
5. Do this for several hundred thousand to million years.
6. Until humans showed up and decided they like non spicy peppers, or yellow peppers, large peppers the recessive genes got "lost" in the gene pool since they happen because of mutations and are easily wiped out.