Stunning loss to Michigan State could make Jim Harbaugh cameo in San Fran moot

A stunning punt disaster kept former 49ers coach Jim Harbaugh from taking his Michigan Wolverines to 6-1. And it likely rendered moot what would have been one of the more intriguing questions entering Week Six of the 2015 NFL season if Michigan had won: Will Harbaugh show up in Santa Clara on Sunday? With Michigan…