Alright, to explain some things:
Meng Hao had these magics called Demon Sealing Hexes. He already had eight, but needed nine for his next power-up. He kept trying to create the ninth, but the will of the Heavens itself kept blocking him from doing so, because the Hex was just too op to exist.
To circumvent that, Meng Hao created a clone to do it for him,
Fang Mu. Said clone started with the Hex, managed to make it quite powerful, but only ended up completinh one sealing mark, from a total of nine. Then, he decided to just die and reincarnate, with his next lives completing one mark each. The thing is, the sealing marks were branded on the souls themselves, basically, giving them the power of the Hex itself, and the Heaven Sealing aura it has.
After seven other lives going fine, the last one was
Little Treasure, who had to actually carve the Hex out of wood. The will of the Heavens tried to stop him, but he managed to complete the thing.
Physically, he's a normal dude, most of the other reincarnations were, but they have those sealing marks on their souls. He's actually 1-A with both the Hex statue, and with said souls of his nine reincarnations. It doesn't really make sense to make it different keys, since both the body and soul *are* him, he's 10B and 1A at the same time, just with different things, much like MM is 10B with his body, but High 1-B with his powers.
It's just that basically everyone in the verse has the ability of just surviving as a soul outside the body, meaning that killing the body doesn't actually matter that much. People have their bodies destroyed and still stay around as a soul all the time. Even if destroying the 10B "shell" would count as a win for MM as you say, the souls can simply create another body, like all those guys with type 8/9 immortality and Low-Godly regen.
Like I said, it's fine if you don't think that should qualify for the top 10B, but shit like this is all over that list in the first place. ┬»┬»\_(Òâä)_/┬»┬»