Senior citizens and Buicks

You’ve got it a little mixed up here. The original lineup was Chevrolet-Oakland-Oldsmobile-Buick-Cadillac. They filled in price gaps and came up with Chevrolet-Pontiac-Oakland-Oldsmobile-Viking-Marquette-Buick-LaSalle-Cadillac. It lasted only a few years before they cut it back down to Chevrolet-Pontiac-Oldsmobile-Buick-Cadillac.