I was hedging with "essentially". I didn't want to make an already biogeeky post too obscure. Some proteins can renature without chaperones. Also to quote the

I was hedging with "essentially". I didn't want to make an already biogeeky post too obscure. Some proteins can renature without chaperones. Also to quote the wikipedia article, "Chaperones do not necessarily convey steric information required for proteins to fold: thus statements of the form `chaperones fold proteins` can be misleading."