He is a smart guy, so I am pretty sure that if he were to call anyone, he would only do so if he knew someone there. I figure he might know the adcom personally where he did his residency or med school (both public schools in other states), but I thought it most cases, it might come down to him calling a neurosurgeon at another institution, which after that the neurosurgeon might call the adcom at his/her respective school and put in a good word.
I got the point though. I certainly won't ask him to call every school I am applying to. I will let him know where I am applying, and if it seems as though he might be able to have some pull in some schools, why not, right?
Also, I am only going to apply to schools where I think I might have a chance.