In other words, my point is

You don't just get the ability to manipulate souls one day when your stand has nothing to do with them beforehand for no reason.

The ability to control the souls of others would never manifest just because he got another personality. I know that from actual experience.

So I think there must be another cause for it. Like perhaps, a powerful mass of energy came into his Stand from something like the arrow, just like in my case...

...no, not something like the arrow...

It WAS from the arrow. I've figured out where the madame's "missing arrow" went. It was inside King Crimson all along.

"King Crimson", "The Dual Personalities", and "The Energy from the Arrow"... These three elements combined have created Requiem...!