If Garcia KO's Matthysse, I'll get a DSG haircut so I look like him and Angel. I'll do this until DSG is defeated.
If Danny lost, I wouldn't cut my head off, but I'd cut out fatty PR food from my diet (no fried empanadillas, no rice with lechon in it etc) and I wouldn't eat another cheesesteak for the rest of my life. I would probably train my ass off and meet Matthysse at a 172 lb catchweight to avenge Danny.
EDIT: I would seriously consider getting an Angel Garcia quote tattooed on my arm.
Something like "The world don't know nothing; only I know everything!"
or "The truth is the truth and the truth hurts"