Seems like they have to combine disparate classes to make a large enough field. That seems like maybe they are splitting hairs too much. It also makes watching and following a race too hard, given the constant cutting by the cameras. Not that much fun to watch as a single spec series.
Great article. Thanks for assembling. Its good to have a summary on the classes as they evolve from year to year. My favorite place to watch IMSA is Road America...Thundering speeds and fabulous racing!