Forum:Grimmjow is a Vasto Lorde?

I think that Grimmjow is a Vasto Lorde because when Arrancar release his zanpakuto he look like he looked before becoming an arrancar right? And as we all know, Grimmjow lookid like a panther as Adjuchas. But when he released his zanpakuto in fight with Kurosaki, he looked more humanoid. So perhaps he really is a Vasto Lorde class.