Whats beautiful about this is that this arc, Fishman Island as a whole, didnt show even 50% of the Straw Hats power, all the good stuff came AFTER this arc, but still, real good in this arc
I think they commented on how different gear 3 looked. Before TS Luffy whole arm became gigant when hitting with gear 3 but now he directed to only his upper arm. Is more clear if you watch his fight against Lucci or the pacifista and compare how gear 3 looked then and how it looks now.
I heard that too. If Caribou was not a side character and a dirty one, he might've had a story of how he trains and awakens his devil fruit power and avenge his fellow brothers who got killed by that octopus race lol.