That is indeed another improvable alternate theory. From my perspective, it's unusual to commit suicide in such a silent way, with such elaborate attention to

That is indeed another improvable alternate theory. From my perspective, it's unusual to commit suicide in such a silent way, with such elaborate attention to detail. He could have killed the copilot, and had knowledge about disabling beacons, perhaps also about avoiding radar detection. But why? As an elaborate prank in creating the greatest mystery in aviation history? Hijackings are usually far more loud. Distress calls, passengers contacting loved ones, a manifesto is published, or the airplane is destroyed defiantly (GermanWings, Q400 2018 incident, ...). Everything about it is extremely unusual.