I have a question about the admit process

I applied around 11/20 to UT and heard back on 12/15 and was accepted to McCombs!! I’m just wondering why I heard back so quickly since I didn’t do the priority deadline but other people that I know who applied early to McCombs still haven’t heard back. I did get auto admission and I had a pretty good essay and rec letters, but I’m just curious as to how I heard back so quickly.