I was thinking that too but fullbringers are just people still using hollow power. The only difference between a fulbringer and an espada or Vizor is that fullbringers are more or less just humans that can tap into their supernatural hollow powers that they were supposedly born with. There's more to it but I didn't really read too much into fullbringer I see it as still a part of Ichigo's hollow strength that he's using now. Really full bringing may just be a vastly inferior ressurecion just for people and they retain their personhood
