Jacob is more intimidating at a bigger size imo. Let's not act like we know his routine. Maybe he's bulking. We know nothing.
Respectfully, I was 300 pounds last year and 218 pounds now. From chunky like Kevin Owens to Roman Reigns. It's pretty easy to tell when someone is letting their diet get out of control if you've gone through the fitness journey yourself.
In this case it's kinda visually obvious even to non-lifters. Him being as athletic and agile as he is, I feel carrying around all that weight is asking for injury. I do agree he should still be a heftier guy though. Not only is he naturally big like most samoans, but as you said, it adds to his presence.