

That I can’t really answer, as there’s no real in universe measuring stick for bending power. Some people clearly just have more oomph to their bending though, though I can’t say if any bender could reach that peak level through training, or if they have to be born with a certain level of talent/power. Zuko certainly shows that bending can improve through training. In flashbacks we see him struggle with basic bending techniques, and little natural ability.
Conversly, in that same flashback, Azula makes a good argument for natural talent, being a bit of a prodigy at it. Korra takes that argument even further, being able to bend 3 elements when she’s like 5 or something.
If we think of the time the Gaang assaulted the earth palace to talk to the earth king, we see them fight through pretty much the entire Dai Li/palace guard to get to the king. These would all be highly trained earthbenders, some of the kingdoms elite. But they essentially get chewed through by 3 kids.
So basically, much like real life, training can help a bender improve. A lot. But also like real life, sometimes people have just a ridiculously high natural ability that pushes them above the herd. Aang, Toph, Katara, Azula, these are the Jordans, Gretzkys, Kobes of the bending world. So both nature and nurture.
Apparently he’s nonpartisan, at least according to this daily beast article And while I agree with you to an extent, the REAL Republican thing to do would be to not resign, and try to blame the city attorney for hacking his phone.