So you know how peculiars have 2 souls right?

And in Harry Potter, if a witch or wizard murders someone, they can split their soul and make a horcrux right?

Well, if a peculiar witch or wizard were to make a horcrux, would that horcrux contain an entire soul because peculiars have 2 and half of 2 is 1?

Also, what if Caul made a horcrux and that's how he managed to keep his peculiarity despite being a wight?

What do you guys think would happen if a peculiar split his or her souls and made a horcrux?

And what would Caul's horcrux have been?