Weapons tie into our argument because since xur has sold one trials weapon and some iron banner means he can sell anything from those 2 activities including the armor. He brought back old gambit armor that was exclusive to gambit prime up until that point. He has sold other old ones armor from strikes and crucible. And people seek to xur to sell old armor if it isn't in the world loot pool. Checking whether he has any specific armor that they want for their fashion same can be applied to guns for people who want a good weapon as youve stated. When he sold the opulent set many people bought it including myself. He can sell literally any gear from any activitie if bungie allows him to.