11 who is 12's old model was such an interesting idea I wish it was more than just a random but hopefully they do something more with him in street fighter 6
Also, they both trained in the Secret Society. But Gill becomes the Chosen One, while Urien serves as underling. Gill and Urien are based on the relationship of Jesus Christ and Judas Iscariot. Judas would betray Jesus which leads him to the cross.
Out of universe it’s because they wanted a playable character who could function like a balanced Gill. In universe, they’re brothers and went through the same training program from the Illuminati.