[quote=@poog the pig]
[@Rtron]

Also, who's to say I'm not going to train the Cosmic Knights? It would be silly to just give them powers and then throw them at Xerxes, even then, the "Hell" part comes when Lif confronts Logos.
[/quote]

How long are you going to train them? You wait too long and suddenly it's a far more vicious fight than you expected, drastically increasing your losses. You wait too little and you have to deal with more than a few Cosmic Knights getting subjugated by Logos because, from what I understand,  it takes years  for Astartian Magic to be developed to its full potential for your average mortals And blessings of emotions only deal with the desire to sin all around Xerxes. 

Even with bits of Vakarion floating around in them, if I understand [@Antarctic Termite]'s explanation, if you leave the mortals in control, but loyal to you, you're not going against Vakarion's will that the arksynth be used by mortals.