Why doesn't he shot synthol in them like Flex wheeler does, its clear that his arms will never grow an inch more then what they measure now
It will probably make them look worse. Flex is the only guy I know on whom Synthol looked good.
He talked about it here in his posts, saying he's only 23 and has a lot of time to work on them, but I don't think he'll be able to bring them up to match his torso or legs, which are pretty good.
The guys with great arms like Lee, Phil Heath and Ronnie had great arms to start with.