Do I need top and bottom teeth expanders if my top teeth are fine?

I have recently been given removable expanders for both my top and bottom teeth. My bottom row is all out of whack, with overcrowding and a snaggletooth, but my top row is fine with spacing, with even a small gap between my front teeth. My ortho says if we expand the bottom teeth, we need to expand the top, as "expand the jar, expand the lid." I did some reading, and I have never heard of using both expanders for this reason. I would like to not wear both if I don't have to.

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