Merab Dvalishvili takes issue with Tim Welch's comments ahead of his fight vs. Sean O'Malley. Dvalishvili (17-4 MMA, 10-2 UFC) challenges bantamweight champion O'Malley (17-1 MMA, 10-1 UFC) Sept. 14 in the UFC 306 main event at Sphere in Las Vegas. O'Malley's…