Michigan fan here. Darrell Funk is no longer with Michigan . . . he was not retained when Harbaugh became the head coach.
The new OL coach, Tim Drevno, is also the offensive coordinator. Last year, he was the running game coordinator and OL coach at USC, where Max Tuerck earned All-American honors on the OL. Previously, he served as the OL coach with the 49's from 2011 - 2013, coaching Joe Staley, Mike Iupati, and Alex Boone among others. (Boone might be your best resource to find out what Drevno is like. I'd assume someone on the board is in touch with Boone. You already are aware of how Boone feels about Harbaugh.) Drevno was at Stanford from 2007 - 2010 (under Jimmy,) coaching the tight ends for two years and the O-line for two years. Under Drevno, the O-line was 2nd in the nation in fewest sacks allowed, and they anchored a brutal running game for the Cardinal.
Suffice to say, Drevno is an upgrade over Funk. His tenure at USC, the 49's, and Stanford speaks for itself. He is heavily involved in recruiting at Michigan. Currently, Michigan has commitments from Bredeson (#1 OG at 247), Onwenu (#8 OG at 247,) and Swenson (#10 OT at 247.) They are in strong contention for Terrance Davis (#9 OT at 247.) And it is possible they would sign a 5th OL in the class.
I won't make excuses for the OL play at Michigan. It has been substandard for a long time. Having said that, OL is the area with the longest lead time needed for development. If you look at the depth chart, Hoke's first class is only now redshirt Juniors. They were expected to have made the jump in this coming year. Should Drevno coach them up, and they have the requisite strength development and mastery of footwork, we could see a significant jump in the OL this coming year.
One more thing. It has long been rumored on Michigan boards that there are several unannounced medicals out there yet to become public. My understanding is that at least two of these are on the OL. The depth chart is not perilous, but recruiting a strong OL class is critical to what Harbaugh wants to do. If there are two medicals, plus attrition of one or two, plus graduation of one, a class of 5 on the OL is needed.
I think a few of you on this board forget how critical a solid OL is to the overall success of the team. I for one believe that if Michigan had had a better OL, it would have significantly changed the record over the last few years. Harbaugh gets this, and you will see an emphasis on the OL going forward.