What positions would you sacrifice for better OL?

[TecmoBengals]

RB, rationale:

1) Taylor and Burrow are running an offense that passes 70%+ of the time.
2) Higgins and Chase are the young studs at WR & on rookie deals. This necessitates the offense is going to use them as weapons.
3) Many teams go with the trend of not investing a high draft pick in RBs or investing a lot of dollars into the position.

I'd say buh bye Mixon and invest a 2nd to 4th round pick on a RB replacement to free up money for the OL. I fully note that I am not one to seek understanding about NFL contracts and related cap space issues, so I'm guessing "ditch Mixon and save money" isn't as easy as I suggest.