Dynamic of the crew is just like majority of the big pirate crews. When he gains more people, he'll have commanders and so on. You can have a strict hierarchy with 9 people group.. who are all your friends.
First mate simply means second-in-command, which is Zoro. Luffy is the first-in-command... There is a hierarchy, however its simply not applied or enforced. There is always a hierarchy in a pirate crew, and Zoro made sure to enforce it. No one is above the captain, even luffy was getting dull on that.
From the manga storyline yes. From what Oda used it for.. it was for comedy. And Uroge is not your average fodder in one piece. He is a pirate above Sanji and Zoro. He has credbility more than the "8-foot tall".. considering people have already seen his size now.
False, Doflamingo cannot gain a bounty because he was already made into a Warlord, while Law had the ability to keep on gaining his until he got made into one. << 2 different things. Mihawk can have the least bounty, but nontheless his prowess will be determined by him being the strongest swordsman and a warlord. I never used bounties as the sole way to determine it. I use bounties as 1 of the reasons together with the other reasons i stated.
Luffy +Zoro + Sanji get stronger = get higher bounties = manga mechanic.
Roger forces rayleigh to join him = Luffy forces Zoro to join him.
Pirate king (captain) + Dark king (second-incommand) = Luffy + Zoro
^^^^^ All of these things can't be missed. And also, it isn't about them being right, it is about Zoro's status as second-in-command and how its been shown hes in command after luffy through portrayal, through character statements and so on. You can deny the above things by seperating them, but really can't deny them as a whole.
Can you showcase him talking about "luffy's dream"?? no, you are making the assumption he was doing it for luffy's dream, it could very well be over robin and Nami's sake like hes usually tripping over them. Or simply because he wanted to protect the crew. Why instead of Sanji did Oda make Zoro go? emphasis on him being Luffy's first mate.
As for the the other one.. ehhh no not really.
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But thats just one, you said there were many.
2 different situations. In that situation when Sanji/Nami/Chopper were yelling and so on .. Zoro was in the back simply analyzing and kind of getting mad. Because Ussopp was being childish, and for Zoro them beings pirates isn't some game as he made clear. He had no problem with Luffy saying that, he even made the emphasis on "thats what a captain is".
^^ Even in that situation Zoro is kind of the one who stood out and had a different reaction compared to the others.