Does a debtor have to waive his right to plead that he and his wife have "too few creditors"?

not subject to a bona fide dispute. She is bound by this waiver and judicial admission. See Mason v. Integrity Ins. Co. (In re Mason), 709 F.2d 1313, 1318-19 (9th Cir. 1983) ("[the alleged debtor] waived his right to present this defense [of too few creditors] by failing to raise it in an answer to the petition. The lack of the requisite number of petitioning creditors did not deprive the bankruptcy court of jurisdiction to enter a valid order for relief"). This means that only one petitioning creditor was required.