Becoming loyal is not an amazing display of character development.
- calls luffy the pirate king, is the first strawhat to do so in baratie.
- saves smoker in alabasta. when lauded for it by the crew? tells them he's doing what his captain told him to do. further goes on to talk about how he would be the boss of any organization he joins in, while recognizing luffy as his captain, in the same arc.
- enies lobby, enough said. zoro is still the only one amongst the east blue 5 to never leave the crew/betray his captain.
- thriller bark, enough said.
- post war arc, once again doesn't care about his pride and asks his enemy to train him - all for the sake of his captain and crew.
"NoT aN AmAziNG DiSpLAy Of cHaRaCtEr dEVeLoPmEnT"
Give it a break, you can cope anyway you please, Sanji is a 100 times better written than Zoro, you can have Zoro being stronger, because thats the only thing you fanboys care about anyway.
atleast thriller bark didn't make half of the zoro fandom fucking hate zoro and drop one piece like what happened with sanji and wci.