I wasn't planning on using the same bosses, this would be farther in the future. The lord souls would be in other beings by then, ones that we could create. We would have room to create what we want, but still stick to Dark Souls lore at the same time.

Sorta like how you The Old Iron King possessed the Old King Soul in Dark Souls 2, which was said to be either Gwyn's soul or a part of it, we could have our own different bosses that're hosting the souls.