Subtype Brain imaging!

I have always been concerned that subtypes are significantly obscuring the experimental data of all sorts from brain imaging to behavioural studies. The gene discovery has highlighted what we already knew before: Different genes can cause or shape the development of stuttering. Think about all those brain imaging studies: those stuttering brains, a mixture of different gene subgroups and other causes. Shouldn't we not just do those with the discovered gene and see what their brains look like? We should get a sharper image! That's what true science is about: zooming into a phenomena. It's very simple: we just need to repeat all the past experiments only for this one subtype.