Disbarred Fort Lauderdale, Fla., attorney Scott Rothstein, who is preparing to plead guilty to engineering a $1.2 billion fraud at his former law firm , didn’t deal with all of the victims who have come forward claiming losses, his attorney said Wednesday.

The remarks by defense attorney Marc Nurik, a former colleague at Rothstein Rosenfeldt Adler, lends credence to suspicions that feeder funds and others were pivotal in expanding an alleged Ponzi scheme dating back to 2005. Prosecutors have referred to alleged co-conspirators without identifying any of them, and Rothstein is the only one to face criminal charges so far.