A growing concern among Detroit OEMs - and increasingly Asian and European automakers producing in the US - is the flow of talent out of key Tier 1 companies. As suppliers' fortunes continue to unravel, sources say senior managers are beginning to depart bankrupt companies such as Delphi, Dura, Dana and Collins & Aikman, not to mention the likes of Lear, Visteon and even Johnson Controls and American Axle.