Bringing in talent for the short term isn't necessarily bad if you do it right. Sign a 3 year contract with high buyout so we get some cash if he's poached. Have him introduce Roehl to his circle of friends to build contacts.
I was at a Fortune 100 company for a number of years. It was "unofficial" policy to have a mix of lifers to maintain culture and short term high flyers to shake things up. Seemed to work really well.