Well apparently now that they moved the achievement that unlocks your last 4 loadout slots to guatdian rank 8 its a new grind to do to get your loadout slots unlocked. At a 460 score requirement that's looking like at least 230 matched activities. pretty much never see anyone get more than two, getting 1 is common though so my estimate is probably pretty low. Got myself to 1800 last night and still only at like 300 commendation score. It's gonna be a long grind Hopefully that part doesn't reset each season like the rank itself