Loki isn’t the arc villain
We haven’t ever seen an arc villain introduced chained up like this. On the contrary characters chained up always end up being allies.
See:
- zoro
- Yamato
- Everyone from udon
I’m betting the truth is that Loki didn’t kill his dad, but was instead framed for the crime. I think the true killer was Shiryu, who took the fruit for Teach.