You can see a part of his real arm. Between his enormous shoulder and his mechanic elbow you can see his biceps (it has a huge vein on his left arm).Have to get used to Franky's new look the most but I think it's cool it's different. Probably has monsterous strength. I said in another thread I think, that maybe Franky's real arms are insode those things so he can slide into them when he needs to or transform them. Hope they don't stall the reunion too much. When Franky was talking about "new weapons" on the sunny was he talking about weapons on the sunny or was he talking about the crew. Last thing Oda is just teasing. Everybody knows they will come together and kick some ass of some unlucky pirates/marines. So cut the crap and let them meet next chapter.
I agree with you, propsi love the use of sentoumaru and the PX as a way to illustrate how much stronger the straw hats have become. I was wondering how Oda woudl do it. We needed an opponent who luffy fought before and since luffy is obviously going to win it would be pointless to use any real important opponent(smoker, admirals, etc) as a basis. so using that fata$$(who luffy could not even touch) and the PX(who it took everyones combined effort to beat) as the basis is fantastic becuase if they die, nothing is going to be lost from the story and we will have a pretty good understanding of how luffy stacks up.
(becuase i think everyone agrees fake strawhats are useless as a benchmark)