This is a bodybuilder who UNDERSTANDS the extreme importance of progressive resistance when trying to maximize muscular size. He wants to be a freak--to win the Olympia as a monster--and he knows what he needs to do to get there. Pump training just isn't going to get the job done--not if he wants to one day walk onstage at 300 lbs--a feat I believe he can achieve in the next 3-5 years.
I believe Dallas will continue trying to get as strong possible. I would not be surprised to see him squatting 7 plates for 10 in few years down, benching 500 for 5-8 reps, doing overhead pressed with close to 400 lbs, deadlifting 900 lbs, etc.
If he wasn't handling huge weights, he wouldn't be 330 lbs....and if he doesn't get considerably stronger than he currently is, he won't get much bigger than he currently is. This is why he will continue pushing the limits--as far as his body will take him--and this is also why there aren't many bodybuilders out there like Dallas--because they are unwilling to do what it takes in the gym.