Who's our Quarterback?

In my mind, this is and has been THE question since Teh Schaub's implosion and aftermath. More to the point, who does our new coach Bill O'Brien want as the Texans' starting quarterback? Is he currently on the roster? Is he currently on another pro team? Is he in this year's draft? Is he in next year's draft or is O'Brien waiting for Hackenberg to declare? Will we even know after this year's draft? Fellow Texans fans, who does Bill O'Brien want as our marquee quarterback?