There isn't much difference between Leftwich and Pennington. Look at the points put up with both QBs. Leftwich's arm strength, when teamed with Moss, makes both even more lethal.
I purposely made no rules so that the GM could build the system he wanted. If you want a spread offense, screw the tight end. With the right running back, you don't need an attached tight end. When you have a smaller back that has speed (like Darius Marshall), you want to spread the defense out and not have another blocker and defender in the box.
Leftwich: $4
Moss: $5
Josh Davis: $3 - at one point, he was the all-time leading receiver in number of catches in FBS history. He also has good size. He is the possession receiver, extremely consistent, and he could still breakaway from defensive backs.
Darius Marshall: $1
Tyre Brady: $1
Yurachek: $1
That will give you a freak (Moss), an extremely reliable bigger receiver (Josh Davis), and another big receiver (6'3 Brady) who basically had back-to-back 1000 yard seasons at Marshall. Those three with Lefwich? Yikes.
That then allows you either Yurachek for $1 for short yardage situations or you can drop Yurachek and Brady and pick up Chapman for $2 to team up with Marshall in the backfield. Either of those options is lethal.
For those who think Chapman was undervalued . . . where do you put him? He had a ton of weapons on his offenses (Moss, Pennington, Washington, Llow Turner, Nate Poole, etc.), so he was far from the first target of defenses. Yet, his yards per carry were very pedestrian. He wasn't the focus of defenses and still didn't produce as much as Earl Charles did. Was Chapman good? Sure. Did he produce as well as Charles even though Charles had far less talent around him? No.