By Tzvi Machlin Brian Kelly has big shoes to fill in taking over as head coach at LSU (three pairs given the accomplishments of his predecessors). Coach O has come out and said what Kelly will need to do to ingratiate himself in Baton Rouge. Appearing on 1010XL on Wednesday, former LSU head coach Ed Orgeron acknowledged that winning a national title may not be a fair expectation for Kelly but it is the reality. He said that with the players they recruit and the support network they have, he should be able to win a title within three years. “I don’t know that it’s fair, but (national title) is …