This is the first of a two-part column. The second part will be published on Tuesday.Ronald Peterson, the bankruptcy trustee for Mack Industries and Oak Park Avenue Realty, had two arguments for disqualifying David Lloyd — the attorney for the Chapter 7 debtors — from representing 52 defendants in adversary proceedings that Peterson filed to recover allegedly preferential and fraudulent transfers.Lloyd, who also represented Mack for a few days while it was a debtor-in-possession under Chapter 11, owed a duty of …