We're the St.Hollowed Copper Communion

Altered story ichigo and friends have been benched.
During the Blood during the Bankai theft against the SoulReapers and Soul Society .How would things play out if a mysterious muli racel organization appeared and assisted in their fight. How would Yhwach react to the organization ading them .
Can Yhwach and the Sternritters fully trust them if so does this organization of newcomers have their own agenda in the works behind the senes of all the fighting and death if so then what is it they are after and seek from the war.