You don't need to know that much asm to turn smw into a brand new game.
2. couple hex edits
3. import all new graphics
4. A few basic lines of asm.
5. community the hack is targeted for. What does great on the central might fail at other places, and vice versa.
That's all you need.
Like the rest said doesn't matter how good the disassembley is if you don't understand programming. Programming is something that either works naturaly with your mind or doesn't.
Captain Toad is returning to your SNES.