returners

Ok so my theory is, without reading spoilers so I may be talking out of my a$$. That Wilhelm is also a returner, he has all his memories from their previous life (as we can see he remembers the abusive princess) BUT that he's actually the one that caused the jump back in time. So in previous life he was under the Crown Prince's thumb and being abused by the crown princess. He then meets Reinheart and is infatuated with her, and wonders what if he'd met her first? He finds a way to turn back time and lucky him she actually ends up in his region when he's still young this time. So when he meets her and is a child he's actually the Will of the past and remembers her, and sitks to her for dear life. He doesn't know she remembers as well though. Basically he's one obsessive, determined guy.