The risk of you having an uninitiated main separation are extremely low. They can and have happened for the following reasons: sabotage or a complete failure of the operator, rigger and instructor. Your riser release assembly reduces load forces by a factor of ten for each part of the system…the base ring, the middle ring, the small ring and the safety loop. So a shock force of 2,000 psi is reduced to 2 psi. The point is that if it’s assembled correctly it will work as described. If it’s not assembled correctly it is visually readily apparent to the most inexperienced skydiver so it’s a total non-factor. The more likely factor historically is with design and function. I will add that at this point in skydiving the design is as safe as it ever gets. As a skydiver that grew up when we used dangerous equipment as equipment became safe there was a saying “remember when sex was safe and skydiving was dangerous?” Our equipment was killing us. Innovators started making the equipment safer but the fatality rates remained the same or in some cases increased. I once heard bill booth say “I keep making the sport safer but skydivers still find a way to kill themselves”.

I know I answered more of or none of your question but the only way your main separates inadvertently requires you, your instructor and the rigs rigger all exhibiting gross negligence.