Bledsoe needs some time to get a better feel for this offense. the better he plays, the shorter amount of time he'll play. Henson will come in once the offense is in gear, and the better he plays the longer he'll play - the opposite of Bledsoe. he needs to regain some confidence, not that he has a real shot at the #2 spot, but we don't want to totally break him. once he has either taken wing or crashed and burned, Romo will get the cleanup duty - may be as much as most of the second half.
under any scenario, the longer Romo plays (if at all) the more likely it is that the coaches think they might be on to something...