Well, I will admit this caught me flat footed. I like Ray Sherman, but you have to appreciate the fact that it really is going to Garrett's staff.
That begs the question who?
Well I still think Paul Chryst is coming and possibly his brother Geep from the Panthers. Paul has coached QBs and TEs, maybe John Garrett will move to WRs. Geep also coaches TEs. Perhaps even Paul's hand picked WR coach at Wisconsin, DelVaughn Alexander, who learned under Mike Riley at Oregon State.
There's also Jerry Sullivan who was on the 9ers staff and coaches with Garrett for the Dolphins for a year.
My guess, John Garrett to WRs. But it is only a guess.