I think everyone forgets that Cortana was originally meant to be the main villain of Halo 1. Upon contact with the Halo Ring's immense data store, she was supposed to go rampant. But everyone liked her so much, they made an evil copy of that role and that became 343 Guilty Spark. Cortana became a reflection of Chief's humanity, which was only brought out of that armor when she died. Suppose Cortana did digitize herself using the Composer. Everything that has ever been Composed has turned into a monster. While there are unpredictable variables with fictional "what ifs" and Cortana being unique for an AI, if Cortana returned as a result of the Composer, she wouldn't be good. She'd finally be the villain that Bungie intended her to be in the first place.
The ONI mark I find extremely interesting. I have a new theory. Remember in Reach, at CASTLE Base, Halsey tells them in the elevator "You belong to ONI now." Jun is the only member of Noble team to have survived Reach, and he is also in charge of recruiting for the Spartan IV program. What if that spartan is Jun?
Also, that Spartan is clearly male. Very wide shoulders and zero hips = male.
The ONI mark I find extremely interesting. I have a new theory. Remember in Reach, at CASTLE Base, Halsey tells them in the elevator "You belong to ONI now." Jun is the only member of Noble team to have survived Reach, and he is also in charge of recruiting for the Spartan IV program. What if that spartan is Jun?
Also, that Spartan is clearly male. Very wide shoulders and zero hips = male.