KKR (NYSE:KKR) is rumored to soon name ex-Morgan Stanley (NYSE:MS) CEO John Mack as a senior adviser, a person familiar with the situation told Bloomberg.The KKR roaster includes former executives like Caterpillar (NYSE:CAT) CEO James Owens and Bertelsmann’s former co-chairman Richard Sarnoff.The source declined to be identified before the official announcement.KKR & Co (NYSE:KKR) has potential upside of 18.4% based on a current price of $14.57 and an average consensus analyst price target of $17.25.