Dave Roberts on Kimbrel: “The stuff is starting to slide a little bit.” We end the week with a Leading Off with True Blue LA podcast that looks at Craig Kimbrel, whose hold on the Dodgers closer role is as tenuous as it’s been all year. The Dodgers rallied to win in the bottom of the ninth on Thursday, but had to do so after Kimbrel allowed a go-ahead home run, his second final-inning homer allowed to Arizona in his last five appearances. Kimbrel’s ERA is 4.14. Most notable after this latest effort was manager Dave Roberts sounding exasperated during…