Board Thread:Improvements and Issues/@comment-35190283-20200725085203/@comment-10330822-20200727190020

By definition, a Vasto Lorde is the highest class of Menos Grande, which are composites of numerous souls brought together by countless Hollows devouring themselves en mass.

So, by this definition, Ichigo's hollow is not a Vasto Lorde, as it is composed of only one soul, Ichigo's. It is however, "of that class". Because what goes on when a Menos devours hollows is their combined reiatsu is what give the Menos their strength. In other words, its a massive pool of power caused by the multitudes of souls.

To that end, Ichigo's individual soul has a similar power ranking of these multitudes of souls. So it is just a Hollow, but its strength is equivalent to a Vasto Lorde.