I think one has to go unless Harbaugh goes back to TE coach and the guy coaching them at the moment goes back to being an analyst, then there would be a spot open for another coach.
My hope for these next 6 games is that Simon gets a couple of games calling the shots and that we know he is calling the shots. If they do better then we know Simon can do the job and PJ just needs to find an experienced QB coach and get over his need to have the OC/QB coach be the same guy. If Simon does get to call the shots and the play calling still sucks, please look externally and go for someone with a proven track record with Offenses and QBs. I posted elsewhere but I have my eye on Mack Leftwich from Texas State. Seems to be a good play caller and QB coach and is at a G5 school, so if he's looking to step up the P5 we could pitch him on that.