How did the last threat disappear in the last chapter?


In the last chapter of Bleach manga,

> Kazui Kurosaki (Ichigo's son) vanquished the remains of Yhwach reiatsu by
> simply _touching_ it (Yhwach remaining reiatsu).

Is it because Kazui comes from

> Ichigo's bloodline

and is somehow connected to Yhwach?

I am not sure I understand what happened there.

