According to Pistone's own words in the book,the second sitdown(the one involving the $250,000)was also about Mirra putting in a claim on "Brasco". Mirra wasn't asking for a hit on Brasco. If he wanted him dead,all he had to do was kill him,since Brasco was a non-made underling. The meeting had to be called because it involved a dispute between two made guys (Mirra and Lefty)over ownership of Brasco and his potential future earnings ,therefore a formal sitdown would have been proper protocol.