Theory time i was just thinking on how Smoker Knew of Dragon and then thought of this theory Title: Kuina Tashigi Smoker and Dragon connections. As far as we know From Zoro's Flashback, Kuina died when she fell down from the stairs.i mean isnt this too simple. From Zoro's Flashback we can also see that Dragon's ship(revolutionaries) landed in their(Zoro's) Town. So i think it was around that same time when the incident with kuina took place. everybody lost hope on kuina presumed she would have died.it is around this time that Emporio Ivankov Dragon and co arrive at koshiro's Dojo. till now we know that Ivankov has a Devil fruit which can stimulate and manipulate Hormones.So what if Emporio ivankov tried to treat Kuina and succeeded and mind you he is called miracle person(would have performed a lot of miracles when saving lives). As far as we know Koshiro never wanted Kuina to pursue swordsmanship because she was a girl and thats why he contemplated making Zoro his heir rather than his own daughter Kuina simply because of her gender. So what i want to say is what if Kuina lost her memories after she fell down from stairs and then remembered nothing. And koshiro might've given kuina to Dragon to raise her. And you might be thinking why would koshiro give kuina to Dragon?? Because zoro. He might've thought that if kuina remains with Zoro then she would again pursue swordsmanship because of the influence of zoro and she might even regain her memories and this not help Koshiro's cause. Dragon possibly couldnt deny koshiro because they helped them resupply and other needs however he knew as a revolutionary he couldnt raise her let alone luffy. So he takes a decision i.e let smoker raise her since he trusted her and she might live a peaceful life(atleast better than with the revos) And that is how i think Smoker knew about Dragon at loguetown and these connections. So might be thinking about funeral which Zoro attended right? Zoro at that time was still a Child and i guess Children are easy to fool so i think koshiro made zoro believe of kuina's death by a fake funeral which also strengthened zoro's resolve on becoming world's strongest swordsman And tashigi losing her memories might also explain how she lost her battle experiences and became weak. you must remember that it is battle experiences that grows a swordsman into a finer swordsman.and she with her memories also lost her battle experiences from her past. Trivia-Like Kuina, her name comes from a flightless bird. The fact she is named after a flightless bird is a reflection of herself. In regards to the bird itself, Oda stated though a bird cannot fly, it does not mean it never will, And Flightless here can also mean Shackles of her past Memories.i.e she will fly(not literally fly) after her memories return. So what are your Thoughts guys?? P.S- Btw i dont know if anybody in the past made same sort of theory like mine.then my apologies beforehand.