#2 Superstar WWE should have included in the SmackDown Elimination Chamber match - Big E

Rather than include Big E in the SmackDown Elimination Chamber contest, it appears that WWE is setting him up for another triple threat or multi-person match for his next PPV defense. Apollo Crews has received the Randy Orton treatment from Big E - several title matches leading to losses. Crews then demanded another one, despite having already lost a handful.
One way that WWE could have worked a few feuds from SmackDown into the Elimination Chamber match is if Big E was involved. He could have a solid run and eliminate someone, or someone could eliminate him. That would then lead to a program around the IC title leading up to WrestleMania.
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When WWE blends a few different feuds into a match like the Elimination Chamber, it makes the storylines and eliminations mean more than if they feel spontaneous. If Big E lasted until the end and was unceremoniously eliminated, it would also provide the framework for a future shot at the Universal Championship. That would have been twice as effective if Jey Uso and/or Reigns had a hand in his dismissal from the match.
They might be saving Big E for a future shot at the Head of the Table, if he retains past WrestleMania. There were not a lot of potential face challengers on SmackDown after the 2020 WWE Draft, but a lot has changed in the last few weeks.