Probably because the lower weight classes don't eat in a large enough surplus to facilitate hypertrophy.
Also, maybe they just don't focus on their arms as much, which makes them appear smaller.
I...
This, I feel like the first guys were just walking by and only saw the guy beating up on that girl, the rest of those people sitting around didn't do chit.
Second guy was a huge *******
Anyone read the description of his 225 bench video? He explains the sling here:
"It really is great for protecting the shoulders/elbows while benching. Great for getting form perfect and busting...
