Does this mean that primer "stacks" between different primers and Javelins applied to the same enemy get added up? If say Colossus applies Flamethrower for X stacks of fire primer and Ranger throws an Inferno Grenade for Y stacks of primer, does the target now have X+Y stacks?
This would be very relevant for enemies that are very hard to prime, e.g. Stronghold bosses - a coordinated squad could choose primers of all the same element to facilitate combos on the boss more often.
Yes all priming effects from any javelin contribute towards the threshold of whether or not the enemy receives the status effect as long as it’s the same type. So if one Ranger can’t apply Ice, two can potentially if they both contribute with Frost grenade within a short enough window for the stacks to not fall off the creature.