0_Eclipse_0
This is a good plan. As a Marine, he'll have access to many qualified 'instructors', the Rokushiki and he'll have to travel. The traveling will benefit his system sign-ins, while his power level or his 'potential' will encourage the higher ups to place him in the Grand Line for patrols. I'm willing to bet that the locations in the Grand Line will provide better sign-in rewards/bonuses.