figures ND is using the 270 pound dorian offseason shots cause that was the only time his arms looked decently sized.
all other times (ie onstage) his arms were tiny compared to Big Ron:
Gee why would I wanna show Dorian at his best?
and who is talking about size alone? we're talking balance in relation to the arm muscles , we're talking shape and yes Dorian has better shaped forearms than Ronnie , Ronnie's are shaped like a bowling pin they insert higher than Dorian analogous to having half calves , we're talking proportion , the whole package NOT size alone , you have much to learn about physique evaluation
amd FYI stupid the pic above is from a contest where they BOTH were on stage