Based on what we know about Windows Phone's current game lineup and what we've learned about the Xbox One's second-screen experience, it seems like Microsoft is still being terribly cautious about not cannibalizing console sales. That's not the right way to think in the mobile era. Yes, "Halo: Spartan Assault" is a step in the right direction, but it shouldn't be exclusive to Windows Phone. Microsoft needs to promote one of its greatest franchises as much as possible — and exploit crossover with the Xbox One and 360 — so why not branch out to iOS and Android? Windows Phone titles can offer exclusive features and upgrades, but Microsoft needs to spread the mobile love.