I wish I had a dollar for every time a pitching coach thought they had identified a mechanical flaw in a struggling pitcher's delivery, and he continued to struggle. I remember after cutting Allan Embree, the Yankees signed him and they were so excited to get a hard throwing lefty for their pen and Suzynne Waldman announced that Mel Stottlemyre had spotted a very fixable mechanical flaw that would straighten him out. He was horrible that season. I laughed at Stot straightening him out, because Stot never straightened out anyone's mechanics. Embree s*** all over himself for the Yankees.
My recollection is that we had one official pitching coach last year and one unofficial pitching coach. Neither of them found Lester's flaw in enough time to salvage Lester's season. They had the video to review. I don't think Farrell is a guru compared to the others. If he was, he should have gotten Ricky Romero on track in Toronto last year.
Lester may straighten himself out, but I think Bard is a complete lost cause. I think we will learn eventually that he has an injury.