Note: These next couple of missions are different and I will be explaining them in two-part sections. You will be able to click on the appropriate name at the top and it will jump you to the appropriate mission. This is due to the game's programming. This all depends on mission 4 when they introduce Max. If you select Max for this mission, you will get to play with Grit in The Final Battle! and unlock him to buy in the shop after you beat the game. If you choose Andy for the fourth mission, you will get Max as your ally instead of Grit, and you will recieve a different set of missions until you meet Sami. So, you just click on the appropriate CO for the mission and it will tell you what to do. Just keep in mind it only matters which CO you choose for this mission and it doesn't matter after that, so as long as you choose which CO you want to use and which set of missions you want to take, you only need to use him on mission 4.