I'd prefer the devs remove the 'Kahl Go Fast' challenge entirely from Kahl's missions. Giving us two conflicting challenges (Speed and Collection Challenges) at the same time usually will require most players to re-run the mission again if they want all their Stock for the week. As a player who's been playing Kahl's missions every week since they came out, it's more of a weekly chore at this point, and I'd rather not re-run it twice a week.