Hmm, I thought it was more that he doesn't show up unless absolutely necessary, which isn't the same as being useless.
As for the him being the antagonist, that's in Tri right? I've yet to watch that, but from the fact it has the original digidestined in it, maybe it happened before X-Evolution? Cause until Yggdrasil deleted the first digital world, Alphamon was definitely loyal to them, and only turned against them because of Yggdrasils decision to abandon most of the digimon there.
But you do have a good point about Kentaurosmon. He did suceed at his task much better than Alphamon.
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