If anyone but Rockstar becomes the musician, I will Gomu Gomu no Bazooka someone.
Think about it. Emo + Rockstar is his name + Dresses like a rockstar (Spiked hair, long jacket) + Introduced out of nowhere + 98,000,000 bounty (close to Luffy's current bounty) = Perfect candidtate.
Plus, I can picture him busting out a guitar and wailing on someone. A guitar is a weapon = FLCL = the awesomest of awesome.
you mean like franky does. Franky could be the musician that they wanted as well as a shipwright. That is, if he joins after he builds that ship.
For a spy on the SH… I doubt it. Not only for the reason that the WG really doesn't need a spy on them, but also what kind of information would be given back? They are very peaceful. Luffy eats all the time, zoro sleeps all the time, and they have no other motive but to achieve their dreams. It isn't like they enjoy causing terror on the seas.
Though if they were to pull it off, I could see it ending up similar to when Luffy got in a fight with Zoro when he thought zoro didn't like those B-work members hospitality and killed them all.
Hell come to think of it, there have been several spies as it is. people at whiskey mountain to strawhats (in a sense), Vivi in B-works, lucci and gang in water 7, in the filler of G8 with robin, even nami during arlong park to some degree.