Fuji isn't allowed to harm Doffy or any of his crew due to WG system for Warlords. Same issue that prevented Smoker taking action sooner in Alabasta against Crocodile the same. Fujitora did what he did to save people and let Strawhats handle it. Zoro is not hold down by anything to simply cut the thread and save everyone as at least that will help buy time and stop movement for at least another side, not trying to push it away.
Not really, Fujitora let him up and he wasn't even trying to use his full power with him. Zoro would have gotten killed if her try taking on an Admiral. Look with Sabo and Luffy how they face him, Zoro wouldn't do shit at all with him.
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Nah, people understand me. Just not gonna overhype your 'idol' when manga say otherwise about his fighting performance and facing characters. Don't like it, get used to it instead living within lost world of your Zoro-Brain Logic for once.