Have you read five mins M2? I think the same way as the marine does... Tycho sucks, he's kinda Durandal wannabe.
He's not that evil, he's just jealous about Durandal. Tycho has silly plans to stop Durandal (like using the whole Pfhor battle group 7 or cloning himself into Pfhors network).
I think we've seen many Tycho vs Durandal battles, mb you should try something different.
There was an AI called Haller at the beggining of Rubicon which Durandal was jealous about because it was more advanced than him(all this according to Tycho)
Well why not creating a subplot where Durandal faces a more powerful AI(with hacking features like those of Cortana for example, able to clone itself, etc.) after beating Tycho... you could even have a Tycho-Durandal alliance(also showing the contradiction-nature of both AI's) in order to defeat this new AI... and then a betrayal from Tycho or Durandal to beat each other.
I hope you like the idea.
Ps. Sorry for the bad grammar, errors, and fussy ideas.
