SAN JOSE, Calif. — After a flurry of proposals from Sacramento in March to send money back to Californians, a rebate check could still be nearly five months away under plans promoted by legislative leaders, Gov. Gavin Newsom warned, as he argued that his contentious plan linking financial relief to car ownership is the quickest alternative to landing money back in wallets. In a recent interview with the Bay Area News Group editorial board, Newsom criticized California’s Democratic leadership for outlining a plan that would funnel $8 billion through the Franchise Tax Board, which he said could …