up to preference i think.
if id go to "bulk" again, id have 20inch arms with somewhat visible lines, but i now have fully shredded 18inch arms and they look much more impressive
i dont think measurements matter anyway, that is a solid arm.and the question is legitimated, how comes he couldnt build the arms up to that size in all those years before, but now after couple weeks on minimal amount gear,they suddenly exploding.
I can give you three simple answers.
1) Training like a punk
2) Eating like a concentration camp victim
3) Over-obsession with being "lean".
I was reading my copy of "Legends 3" the other day. The story of the late Dennis Tinierio was rather interesting. This cat reporetedly had to push his caloric intake near 10,000, just to get over 180 lb. (and I thought I had it bad, back in 1996).
I've also read accounts about guys like former Mr. Universe, Roy Duval and ASC winner, Mike Francois.
It took years of super-heavy eating to get the major size they possessed, especially Francois. He was once a struggling 185 light-heavyweight. Two years of mega-high calories and heavy training turned him into a monster heavyweight (super-heavyweight, by today's standards).
When he finally dieted down, he was winning shows, left and right.
That, and other examples, led me to believe that (especially without drugs) if I really wanted to get significantly bigger and stronger, it was time to EAT, and I mean EEEEAAATT to put on the mass I wanted.
I only wish I still had my flame-thrower of a metabolism from back then, coupled with the experience and superior protein supplements I have now.