Even when Kerridge "outran the field" to score a touchdown, there were guys catching up to him in a hurry. If the end zone were five or ten yards further, he would be dead meat (that is, if those kids who were 140 lbs. could tackle him). He is slow. There is no getting around it.
Like I said, in a year when scholarships are at a premium (we'll have about 14 or so), I sincerely doubt that Michigan will give an offer to a fullback of his..."talents." There are much bigger needs on this team.