Your distinction only makes sense vs Kizaru though since otherwise, where is BM gonna find just magma, ice and so forth laying around?
It would make sense that, if she knows she is going to fight specific opponents that she goes on a search and then create specific homies but even if you do that, if the Awakening of Logias really works like Kats, the homie size-wise, becomes irrelevant anyway.
Like, we can say that Kid is special since technically, he is not controlling the homies directly but just becomes a magnet and draws them to himself, but it still underlines that BM´s control over homies does not trump other abilities on them, and neither can she remotely create as much as the owner of the element.
Kizaru being light is admittedly different, since light is anywhere.