beta
I'm just assuming but I think Ian has something to do with Noah becoming an omega. They spent a year together and a hyper dominant alpha can turn a beta into an omega. Seeing how he was so affectionate to Noah and always sticks with him when they were in college and Ian biting noah's neck was so suspicious, like bro wanted to mark Noah so bad. Another was in the present him telling Noah "so you're really an omega now huh" and looked proud like "I did that"