The Detroit News (Daniel Howes) reports: Quicken Loans Inc. Chairman Dan Gilbert’s “Detroit 2.0″ initiative is getting new help from an unlikely source — General Motors Corp. Matt Cullen, the 29-year GM veteran who personified its downtown redevelopment push at the Renaissance Center and the riverfront, is leaving the automaker to become president and chief operating officer of Rock Enterprises, a new holding company formed to coordinate and integrate Gilbert’s growing portfolio of companies and investments. The move comes amid fears that the widening scandal engulfing Detroit Mayor Kwame Kilpatrick could stall redevelopment and reverse Quicken’s decision to move its headquarters downtown from suburban Livonia. Hiring Cullen, who will spearhead Quicken’s Detroit development projects, is Gilbert’s watch-what-we-do rebuke to that kind of speculation.