Akshay Shah, a former managing director in Blackstone Group LP’s GSO Capital Partners debt-trading unit who seems to deserve most of the credit for inventing the concept of a “manufactured default” on credit-default swaps, sounds like the kind of guy I’d like to have a beer with: People familiar with his trading style say he pores over hundreds of pages of bond or loan documents, trying to find tiny details that others in the market might miss.