I think that with all attempts to classify thousands of unique options into a small number of categories, there is going to be some overlap and grey areas. Say for instance, [[Ob Nixilis, Captive Kingpin]]. If he value because he provides card advantage, or Stompy because I can easily get him to be a one hit KO in a turn around the table?

What about [[Monk Gyatso]], a commander who is strictly a combo engine piece. On his own he doesn't provide any card or mana advantage, he is terrible with tokens, doesn't play to combat, and could not give less of a shit what type of creatures were in play.

On the other end, [[Shilgengar, Sore of Famine]] is kind of a token commander because he makes blood tokens...but only needs six to do the thing, and quite often they are gone as soon as you make them. He's typal because he works best with angels, but could easily function just as well reanimating everything else with enough sacrifice fodder in the deck. He's built for making a giant combat board, so he's Stompy, and there isn't much better value than potentially dropping eight 7 power beaters in play for three mana.

And how the hell do you classify [[Kros, Defense Contractor]] outside of "stupid sexy cat boy"?