No no no. Durant acquired Oldsmobile later in 1908. The next year, he brought in Cadillac, Cartercar, Elmore, Ewing, and Oakland (later known as Pontiac). In 1909, General Motors also acquired the Reliance Motor Truck Company of Owosso, Michigan, and the Rapid Motor Vehicle Company of Pontiac, Michigan, the predecessors of GMC Truck.
I'm confused. All the brands I listed either are or were GM brands. Also, it's interesting to see that chart now and wonder what it would have been like 20 years ago. For instance, Chrysler and Mitsubishi would have some lines between them, ditto for GM and Suzuki. It's kind of surprising to see Mahindra on there too. About five to ten years back, they were flirting with bringing light duty pickup trucks to the US, but plans fell through for a whole slew of reasons (costs, safety regulations, fuel regulations, etc.). Sometimes, I totally forget that they even exist.