Gao Guang actually didn't need Mike to be his driver now, because after training for so long in the camp, Gao Guang's biggest gain was that his driving skills had improved by leaps and bounds.
In the United States, not being able to drive is tantamount to not being able to walk, and the vast majority of PMC operatives need special driving skills, so Gao Guang definitely had to practice driving, and not just driving, but even how to shoot while on the move.
However, to return to the company, Gao Guang still needed to call Mike, because he could hitch a ride with Mike's car, let Mike act as his driver, and more importantly, have Mike bolster his momentum.
But what Gao Guang never expected was that Walton would also hitch a ride with Mike. This guy clung to him like a plaster.