Good fundamentals make you able to get by with basics with any character. Knowing in-depth how your character works adds on to whatever fundamentals.
Imagine you get to wear these godlike leather pants. But without any underwear underneath, it's not gonna be comfy. You could get by, but it's not gonna be as easy. The leather pants are the character. Your undies in this case are your fundamentals, or your "fundies".
So yeah, Bang, like any character, is great when you have good fundamentals. But come on guys, let's not kid ourselves.
Fuu-rin-kaa-zan is what it's all about.
Yes this post was an excuse to use the word fundies