I personally think there is some room for improvement on what they had in the dyno cell but I also don't think Banks Power had to produce that video and take a stance/comment the way they did as I feel that was unprofessional. IMO all the suggestions Gale made will definitely pick up power but intercooling between the turbos is not really feasible in the car due to space constraints. Also, let's be honest, all of our builds have room for improvement somewhere or something we would have done differently. I do know I picked pretty big gains by making sure my air filter was properly sized for the airflow requirement I was trying to pull through it (which I personally don't think theirs is).
I would assume that SoCal/Hoonigan is using the stock ECM which Banks does not, they use their "Automind" ECU which allows them to run whatever sensors they want. The stock ECM cannot (to my knowledge) support a MAF reading over 500g/s (~66lb/min) which will limit their ability to do MAF based fueling above that airflow which Banks did not point out.