Jerry Dipoto open to the idea of trading a Mariners starter

SEATTLE — So adamant have the Mariners been about not trading from their starting pitching depth that just a few offseasons ago, Jerry Dipoto called it “Plan Z.”

But this winter, Seattle’s president of baseball operations isn’t ruling it out. 

“We’ve always been open to listening,” Dipoto told reporters at this week’s General Managers Meetings in Las Vegas, including MLB.com’s…