Yeah I can see why. But one can assume that their tenuous alliance is quickly fading away, and will probably turn to open conflict sooner or later. They're allies of convenience, and neither side has ever been above doing that for their own benefits. But I can definitely understand your apprehension. I shifted away from it mainly because I felt like there wasn't much to say about them except open war. Which is fair on you, but most of it is only hinted at. If I could rewrite Fallout 3 and 4, I would. Yeah there are no FEV anymore. The goal of their searching in the north was to find FEV, but it's not there. They've been in the Northern Wastes for decades and haven't found it. There's not much I can do about retconning Vault 87, but as far as this story goes, Fallout 4 did not happen as depicted and thus those Super Mutants do not exist. This Unity Army has been on look out for FEV for decades and is now being worn down by the Brotherhood, which has solved its manpower problem in the same way: local conscription.