Why does everyone think that Rosalind's description is true? Red John could have easily manipulated her to give  a wrong description or she could be a disciple of Red John. Everyone thinks that she is innocent just because she is blind!!

I don't think that we should eliminate suspects just because of their height, hair or voice. How would we even know that it was RJ that came to save Jane at the season 2 finale? It could have been any of his disciples including Timothy Carter.