Over at the 2K Forums, Community Manager Bryan Vore explained the process for getting WWE Superstars in the games. With the uproar over the announcement that The Four Horsewomen, Charlotte, Bayley, Becky Lynch, and Sasha Banks, would not be included in the game, this could explain why:
“When we travel to do scanning sessions we scan everyone that we can get into our scan booth. WWE Superstars and Divas are very busy so we take every opportunity to scan them regardless of whether or not we are using the scans for the upcoming game. We want to have as many scanned as possible because the scan is the starting point for us adding someone to the game. It is true that it only takes around 5-10 minutes to scan the SS and Divas but that is step 1 in a long process. After they are scanned it takes our team about 2 months to complete modeling work from start to finish. The kicker is that the model is only part of the work required to add a SS or Diva into the game. Entrances, moves, taunts, attire, entrance attire, music and roster images all need to get developed. In addition, we need to record commentary for each SS and Diva which is a large undertaking all on its own. So, as you can see, scanning a SS or Diva is the least amount of work involved in getting someone into the game.”
This would also explain why they won’t be made available as a DLC, considering the work involved in getting them in the game.