It’s a simple defense really. I’ve seen the point made that the game almost wants or expects you to choose Fergus and I tend to agree. That said, if you choose to save Wyatt, Wyatt himself tells you that you chose wrong and you should have saved Fergus. This more than interesting enough for me to prefer Wyatt, not to mention this puts J in your base as well.
Just a thought that’s been bouncing around my head the past couple years.