I didn't imply that execution is one of those factors necessary for determining where characters stand in a tier list. It's relevant as a human factor, but not much for doa since the game is rather lenient, so it's not very important here.
What is important is how much effort a player needs to put in to kill another character and how many difficult situations a character can put another in, like hard to escape situations or a need to make a hard read/guess.
Comparing toolsets are okay, but there's a way of adding the human element like creating nitaku or strike-throw situations for someone using those tools.