User blog comment:Lukwisnie/Cars 3 (Lukwisnie)/@comment-4780352-20120824203944/@comment-3996578-20120825180417

Well, the races in Cars 2: The Video Game are simulations, so maybe Grem and Acer are part of the simulations. However, for Mater's Brick Tales, it's not a simulation, so maybe they weren't killed.