Could i use my ironfall to use ironhax without having hax already? it sounds stupid, why would you even want ironhax if you already could access homebrew anyway???
1) No, you need another homebrew entrypoint to install Ironhax.
2) I didn't have any homebrew in my updated New 3DS before Ironhax was released, so I (and many others) used Tubehax (which needed an internet connection to be used every time) to install Ironhax.
Tubehax is dead now but I still have Ironhax and I didn't have to buy a $70 piece of crap of a game named Cubic Ninja to get homebrew/emulators and custom themes in my 10.3 N3DS since you can update the payloads with Ironhax itself.
Now, can you explain how is that stupid?