Chicago lost their 2nd string FB, Obafemi Ayanbadejo, for 4 games for a steroid violation. He does not matter at all to Chicago's run blocking.
In any case, an easy way to judge how well a team run blocks is to see which RBs get a lot of yards each year. That's a good indication of run blocking. Or you can check out the offensive line rankings at FootballOutsiders.com
The cake is a lie.