A new era begins this week for the L.A. City Council: the two newest LA Council members take their seats, replacing two of the oldest. David Ryu and Marqueece Harris-Dawson take over for Tom LaBonge and Bernard Parks, who are both retiring after more than 40 years in city government. It’s hard to think of two more different politicians: LaBonge, the genial team player and Parks, the sharp contrarian. What are their legacies? And what’s in store at city hall after they’re gone?