1. ok then I'll remove in-character, but it still doesn't change the fact that Sakura isn't going to hit a flying object that's faster than her
2. All people who possess chi, chakra, ki, etc. will use Stat Amp instantly when a fight starts. Take Goku for example. Without ki flowing through his body, he can be hurt by bullets, yet Suppressed Goku in the Tournament of Power is tanking hits from SSJ2 Caulifla, who is clearly stronger than a bullet. Technically both Sakura's and Wendy's stats are calculated when they have life eergy flowing through their bodies, but Wendy's is superior due to actual amplifications on top of her "natural" stats.
3. Where are you getting the calcs? I can't find them anywhere on this wiki
4. I never said that water was the issue. I'm saying that the surface area Sky Dragon's Roar and Sky Dragon's Wing Attack covers is roughly the entire coluseum, while a kunai's surface area is a few centimeters, probably less. Since I put Dresserosa Colluseum instead of all of Dresserosa, that means that none of the characters in this roster is able to leave the colluseum. Sakura should worry about Wendy's explosions because she is not doing anything agaist Wendy (since she's probably flying), but Wendy's getting at least some damage done. Wendy can also increase her own durability with Magic Power as well.
5. "Large speed advantage" does not mean "blitz". Also, right, she can't fly, oops. I'm not going to include Carla or Katsuyu, cause neither Chopper notr Orihime can summon animals at their will. Throwing chunks of the coluseum isnot going to work against any member of this roster (i mean, when HAS it worked in anime?), and smoke bombs isn't going to work against Wendy, because not only is her sense of smell good enough to smell minuscule amounts of gunpowder tens of meters away, but also she can disapate the smoke with her air manip. As for Shadow Clones, she can't actually make any. Neither the Naruto Wiki nor eher profile on this wiki state that she can. As for Stat Amp, Wendy has actually shown to remove Stat Amps from other beings with Deus Zero, as shown in her fight against Irene. So, I'm still leaning towards Wendy in this fight.
As for how long this fight takes, well, Orihime will probably die within the first few seconds, cause her Koten Zanshun will probably be crushed once she tries to use it. Chopper will last for a few minutes, cause he will eventually realize that Monster Point is the only way he can fight Wendy and Sakura (and Monster Point wears off after 3 ish minutes and he can't move for 2 hours after that). As for the rest of the fight, I believe that it could possibly take a few hours to a day, due to Sakura's Thousands Healings and Wendy's infinite power/energy source.