Well most of em I would say would be "advanced" staves, but with care, time, and a sinew backing, maybe some steam bending for a couple as well, I'm sure you could get a bow out of each one. But it is up to you. Most of em as I said are troublesome staves, hense the reason I am trying to get rid of em!
That and my wife constantly murmuring ever so faintly about how I have turned the upstairs into a lumberyard...