Webinosuke's surname contains the kun'yomi reading of the kanji for beak, bill (嘴 (はし) , hashi?) and broad, flat (平 (ひら) , hira?). The reason it is pronounced bira is due to. Webit seems to be heavily implied that he shot up straight to hashira in two months. And while, yes, tanjiro and inosuke definitely aren't on his level of skill, they've accomplished feats that literally only hashira have managed to pull off (that being defeating kizuki demons). Webinstead of training the usual way under a formal hashira, inosuke beat up a demon slayer with his bare hands and stole his sword, basically becoming a member. Webit's been a while since i've read or checked, but i assumed/remembered it as kinoe+50 demons or kinoe+kizuki, mainly due to the fact that tanjiro and friends didn't get. Webtwo other hashira, however, do not take part in the training for different reasons. The insect hashira, shinobu kocho, does not train with the rest of the hashira. Webthere were hashira that lost to daki alone, the current hashira are monsters compared to the previous generations. Tanjiro and the gang absolutely qualify to be hashira.
