A law firm pursuing a suit against Uber Technologies Inc. claims it found new evidence supporting its argument that it shouldn't be disqualified from the case because of the work one of its lawyers handled while working alongside the ride sharing company in a prior gig with the Chamber of Commerce.

The source of the evidence? Declarations in a new suit filed against the law firm by Uber's biggest rival, Lyft Inc.

The labyrinthine tale of the former Chamber-lawyer-turned-plaintiffs lawyer now in the crosshairs of both Uber and Lyft didn't really get underway until September. That's when lawyers from Keller Lenkner, including former Chamber lawyer Warren Postman, filed suit claiming that the way Uber classifies its drivers as contractors allows the company to unfairly compete with the firm's client, Studio City, California-based livery service Diva Limousine Ltd.