Yes and no. It doesn't sound like you really understand what a bottleneck is. A bottleneck does not imply that the GPU is forcing the CPU is slow down. A bottleneck is just the slowest component of the system. In your example the GPU is still a bottleneck because it cannot keep up frame-rate wise with what the CPU is capable of delivering. A system can never be PERFECTLY matched so something is always going to be a bottleneck, but in a balanced system it should be small.