Gov. Jerry Brown will leave state government in November, but the man most closely identified with Brown’s education legacy for leading the State Board of Education for 15 of Brown’s 16 years as governor, may not head off with him. Michael Kirst is thinking it through. Brown has renominated Kirst and two other current board members, Ting Sun and Patricia Rucker, for additional 4-year terms. The state Senate will have the final say, but Kirst, for one, hasn’t decided whether to pursue it.