This week, Daniel Howes says the “goods news” of General Motors Co. finding a potential buyer for its Lordstown Assembly Plant in northeast Ohio is drawing mixed reactions because the potential results could be mixed. Replacing the scale, jobs and payroll of a modern auto plant is next to impossible in an increasingly lean – and non-union – private economy. And the wrenching experience is exacerbated by the lowest unemployment rate in 50 years and economic growth running north of 3 percent.