That thing was really dangerous, as it would be just like some kind of virus or parasite inhabiting his consciousness sea, and that was under no circumstance something good.
No matter what a mountain could not hold two tigers, and two sharks in a pond were too much. That little thing would grow one day and would most likely try to occupy his consciousness sea.
Not to mention that he would have nothing to gain out of him, as he would just increase his already peaked desire for revenge and blood.
He was so lucky to have paid attention to this thing and not let it slide, otherwise, he would just have a ticking bomb inside his consciousness sea.
With that taken care of, it was time to deal with the big guy that went towards the center area where his Soul Avatar was supposed to be. While this thing was bigger, it was less dangerous than that little one.