He wanted to be the greatest puppet master. He had the talent, he had the skills. He had everything required to climb the peak of puppet mastery. Bloodline doesn't play a major role in puppet masters. Even if you are low rank, you can control others much higher than your rank if you have strong willpower.
However, there is one thing that blocked his way. That was resources. A puppet master needs resources in a much greater amount than others.
If you are spirit summoner along with the puppet master, you can control others, and even living beings with the help of spirits but if not you can only control puppets created with huge resources.
But he was neither a spirit summoner nor did he have money. His talent was overshadowed until he found this group of maniacs that decided to nourish him. He was reluctant to join them but he had no other option. Joining them, he found a new way to use his skill which was to control ghouls, corpses and the dead.