Like why would the main Brotherhood (at the time before Lyons expedition) send the descendant of the most lauded founder of the organization dating back all the way to the aftermath of the Great War with some contingent all the way on the other side of the country? What basis would this have? Its especially damning since there are no other Maxsons (because apparently the Maxson dynasty never bothered to have multiple children despite being part of one of the only societies in the Wasteland with the readible privilege to do so, even being at the top of the hierarchy of said society nonetheless) in the first place, the main council of the BoS would never greenlight such an action. Its almost as if Bethesda only strung this Maxson because they probably already had their horrific Fallout 4 plot already on the drawing board and needed an excuse for spawning in this particular Maxson. (I only say this because they already had their stupid Blade-Runner rip planned in lieu of the "Replicated Man" quest in rivet city).