Short Answer : YES.
Foster is awesome, but Murray an the Cowboys might be heating up at the right time. There has to be a concern that, in order to preserve Foster, the Texans either sit Foster or severely limit his carries as we enter the FF playoffs. I swear, NFL Head Coaches have no respect for FF head coaches.
On the other hand, you trade White for AJG and Cobb...both of whom are WRs who could outscore White on any given week. BTW, White may be sat or may deal with limited reps bc of NFL implications as well.
I see it as a great trade for you. You trade two great FF players,who might not help you in the FF playoffs, for three talented FF players who WILL (barring injury..Im looking at your Demarco Murray)