I have bashed Drew as much as the next guy. But Drew is playing better by Willis taking the load off of his shoulders.
1) Drew actually spun out of a defenders grasp which would not have happened ear;ier in the year.
2) He took off running a couple of times.
3) And here is the biggie, Willis is getting 30+ plus carries so Drew can play action easier and the defenders are not blitzing every down like earlier in the year.
3a) By the defenders not blitzing as much, the OL is magically starting to look better.
3b) Willis is a better pass blocker as well
In conclusion, Willis is bringing up everyones play by his ability to run the ball.