Inosuke doesn't become a Hashira in the manga. The story progresses with him having other significant experiences and achievements instead of achieving that specific position.
It's hard to give an exact number. Different story arcs and battles led to the deaths of multiple hashira. Some died heroically, while others met their fate in unexpected ways. The count changes as the manga progresses.
Definitely not. Genya remains outside the ranks of Hashira throughout the manga. This is because of a combination of factors such as his skills, experiences, and the overall direction of the story.
Demon Slayer left off in the manga Hashira at a cliffhanger moment. The heroes were at a crossroads, and the fate of the world hung in the balance. It was a point that left readers eager for more.
Reacting to SCP fanfiction is complex. There are those fanfictions that manage to build on the SCP foundation in a positive way. They might introduce new relationships between SCP entities or new backstories that are engaging. But then there are the ones that are just not suitable for a general audience. They might contain excessive violence or disturbing themes. It really depends on the individual piece, and you have to be careful when exploring the world of SCP fanfiction.