All of them are sideplots though, the goal of the the strawhats in wci was to firstly get sanji back and secondly steal a road ponyglpyh rubbing both of which they accomplished. The rest of what you wrote, Memes vc, the tamatebako box, the assassination attempt were all side plots that oda could do whatever he wanted with to make the shs achieve both their objectives.
Here the main objective is the raid to kill orochi and kaido, this isnt a side plot its the whole reason they are there.
I fail to see how if indeed zoro does kill kaido above the flower capital like ryuma and end his 20 plus year stranglehold on wano that he will be seen as anything other than a hero.
Yamato is a non issue here, she already cast him aside and pledged herself for the kozuki
Which is the same plan they have now, which also broke into a war.
With this arc being japan as you say not to mention kaido the dragon representing china doesnt it make sense the sh who oda said would be Japanese could fulfill such a role.
His 2 biggest connections doflamingo and big mom have been dealt with by the story though, big mom is here with him and doffy has lost and is in impel down, with law and the shs destroying the other factories.
Orochi wanted vegapunk and was the reason for cp0s presence in the arc, he is dead.
With kaido taking onigashima to the flower capital the stakes and the path to the end of the arc has been accelerated, i doubt we will see any major players at this stage.
If the marines werent busy enough with the warlords its very likely they are going to have a run in with teach based on his own words
With sakazuki saying they dont have the resources to send to wano theres good reason for that.
Thats probably the biggest reason why meme is here.