I would assume it is because of how they invest more time on giving promos for the main eventers. Reigns and Strowman especially, also they missed quite a bit of time with injury I'm sure.
Aside from Jinder getting the JBL push, and Nia Jax and Sasha Banks' wins; it's kind of worrying how the cruiserweight numbers are superior. The top six are pretty much the cruiserweight division, then you have the throwaway competitors like Gulak, Daivari and Gran Metallik. They need to mix up the booking a bit, like back when we had matches like Paul London vs Booker T or Super Crazy vs Randy Orton, it added some interest. Or when Gregory Helms was cruiserweight champion and feuding with Matt Hardy.