One... Kangutso.... Chain is fucking awesome.

Two... Philly... You make a good point. After all. Now that I think about it... Dani is both the Blacksmith and an Engineer.

Three... Archy... You're right. Honestly, we really don't have to have all their roles: Captain-Obviously, Swordsman (Still not a Rank!), Navigator-Obviously, Gunner-Maybe (anyone can shoot a damn cannon), Doctor-Duh, Archaeologist-Hell, why the Straw Hats even have one? Maybe Historian would be a better title. Honestly, she's really more like the Team Mom, Shipwright-Of course, and Musician-Not really necessary. Just an entertainer is fun, so one doesn't get too bored.