it all depends on the angle with Yates
Someone with large arms doesn't ever need to depend on the camera angle to show it. Yates arms only look big when they are close to the camera (i.e. which is clearly shown in your pics) or pressed against his side allowing it to be pressed outward giving the illusion that it's larger than it really is.
I think Yates was one of the best, but anyone who thinks he had great arms is grossly biased. His arms were definitely his weakest parts.