Isn't his third Timeline...the doctor said that aeroc is neither alpha nor omega?? Or is it false diagnosis?? Hua
I think he was diagnosed alpha but actually manifested as omega and the butler kinda blamed our toxic boy for that but I haven't read the book for a long time I'm not too sure
Spoilers
In the 2nd and 3rd timelines, Aeroc manifested as an omega into his adulthood WITHOUT the sex changing drugs.