i know BJ dropped Sanchez and completely dominateded him from that point on, but BJ has the kind of power that most LHWs don't even poses.. Gomi may have similar power but is no where near as good as BJ..
Gomi also doesn't have the cardio to hang with the pace that Sanchez will bring.. Diego has a hard chin too so even if Gomi lands a bomb he is gonna have a hard time actually finishing Sanchez.
I predict Gomi winning the first via landing some hard shots especially since he is the better striker.. but after that he wont be able to stop Diego's pace and he will get overwhelmed. So Diego wins a solid UD or even a mid-late third round stoppage..
Head-butting fists and KOing the air is not effective striking.