He certainly had an impact on Tesla's supercharger team. I know it goes against the prevailing mythology in the US of great men and visionary leaders but sometimes success or failure have more to do with the market and time. He did recruit a spectacular team for early SpaceX. For all I know he may have had some extraordinary talent for hiring or it might have been luck and a target rich environment. Either way the success of SpaceX was very real and greatly contributed to the mythos surrounding Musk.