I'm not sure if this is known, but when you get a powerup you get a little bit of invincibility frames. You can use this in 6-Bowser to get through a burner and save time by not taking a hit from it (though it is a bit precise).

Basically TAS but not TAS.

I think that the run should end when you do all routes then beat the champion. This is because a lot of games with categories like this follow this guideline (do whatever, then complete game). I completely understand if you don't want to change it.

I'll do routing and stuff.