Let's state the obvious first. There is just no reason to avoid Le'Veon Bell this week against the San Diego Chargers, or any week for that matter.
In his only two games so far this season, he has 191 rushing yards and two touchdowns. To add to those stats, he also has 14 receptions for over 90 yards in the air. With all those receptions, he is going to add around four extra fantasy points to his total just by catching the ball as many times as he does.
The San Diego Chargers are also allowing well over 100 yards per game on the ground to opposing offenses, so Bell should have absolutely no problem leading the Steelers offense this week. With Vick at the helm, he will have to.